Insert Custom VF into standard layout and refresh both standard layout and Custom VF

<apex:page standardController="Leave_Plan__c" extensions="_Leaveplan_CTE" action="{!approvalNeeded}">
        <center>
            <apex:pageMessages ></apex:pageMessages>                
         
            <apex:outputPanel rendered="{!IF(Leave_Plan__c.Status__c == 'Approved',true,false)}">
                <font color="green" size="2"><b>
                <apex:image id="theImage" value="{!$Resource.Smily}" width="15" height="15"/>Your request has been approved.</b></font>
            </apex:outputPanel><br/><br/>
         
            <apex:outputPanel rendered="{!IF(Leave_Plan__c.Status__c == 'Rejected',true,false)}">
                <font color="red" size="2"><b>
                <apex:image id="theImage1" value="{!$Resource.Sad}" width="15" height="15"/>Your request has been rejected.</b></font>
            </apex:outputPanel>
         
            <apex:outputPanel rendered="{!IF(AND(Leave_Plan__c.Status__c == 'Cancel',CONTAINS($UserRole.Name,'Employee')),true,false)}">
                <font color="red" size="2"><b>
                <apex:image value="{!$Resource.Sad}" width="15" height="15"/>Something went wrong please create new record don't edit this record</b></font>
            </apex:outputPanel>
         
            </center>
            <center><apex:outputLabel rendered="{!showAlert}">
                <apex:image id="theImage2" value="{!$Resource.Smily}" width="15" height="15"/>
                <font color="red" size="2"><b>Please refresh the page.This record has been sent for Approval already.</b></font>
                </apex:outputLabel></center>
                <center><apex:outputLabel rendered="{!showAlert1}">
                <apex:image id="theImage4" value="{!$Resource.Smily}" width="15" height="15"/>
                <font color="red" size="2"><b>You are not an authorized to submit this record for Approval</b></font>
                </apex:outputLabel></center>
            <center>
            <apex:outputpanel rendered="{!refreshPage}" style="margin-left:-30%;">
                <script>
                window.top.location='/{!Leave_Plan__c.id}';
            </script>
            </apex:outputpanel>
            <apex:form >
                <apex:outputPanel rendered="{!requiredSection}">
                <b>Please Select cancel reason : </b>&nbsp; &nbsp;
                <apex:selectList value="{!strComment}" size="1" required="true">
                    <apex:selectOptions value="{!Options}"></apex:selectOptions>
                </apex:selectList><br/>
                <apex:commandButton value="Cancel Leave" action="{!cmdCancelLeave}" title="Cancel Leave" alt="Cancel Leave"/>
              </apex:outputPanel>                              
                    <apex:commandButton value="Approve" action="{!cmdApprove}" rendered="{!approveShow}"/>
                    <apex:commandButton value="Reject" action="{!cmdReject}" rendered="{!rejectShow}" />
                    <apex:commandButton value="Submit for Approval" action="{!cmdSubmitforApproval}"
                    rendered="{!IF(Leave_Plan__c.Status__c=="New Request",true,false)}"/>
                    <apex:commandButton value="Cancel Request" action="{!cmdCancelRequest}"
                    rendered="{!IF(AND(Leave_Plan__c.Status__c!="Cancel",NOT(CONTAINS($UserRole.Name, 'Employee'))),true,false)}"/>
                    <!--<apex:commandButton value="Cancel Leave" action="{!cmdCancelLeave}"                  
                    rendered="{!IF(AND(OR(Leave_Plan__c.Status__c=="New Request",
                                      Leave_Plan__c.Status__c=="Approval Pending",
                                      Leave_Plan__c.Status__c=="Approved",
                                      Leave_Plan__c.Status__c=="Recancelled"),
                                      NOT(CONTAINS($UserRole.name, 'Employee'))),true,false)}"/>-->
                    <apex:commandButton value="Reassign"  action="{!Reassign}" rendered="{!reassignShow}"/>
                    <apex:commandButton value="Cancel" action="{!cmdCancel}" rendered="{!IF(OR(Leave_Plan__c.Status__c=="New Request",
                                      Leave_Plan__c.Status__c=="Approval Pending",
                                      Leave_Plan__c.Status__c=="Approved",
                                      Leave_Plan__c.Status__c=="Recancelled"),true,false)}"/>
                    <apex:commandButton value="Re-Request" action="{!cmdRerequest}"
                    rendered="{!IF(Leave_Plan__c.Status__c=="Rejected",true,false)}"/>
            </apex:form>
        </center>
</apex:page>


Apex:--

public class _Leaveplan_CTE{
    //@Initial varialbles declaration
    public final Leave_Plan__c leaveIds ;
    public final Leave_Plan__c leaveDetail;
    public boolean refreshPage {get;set;}
    public boolean approveShow {get;set;}
    public boolean rejectShow {get;set;}
    public boolean reassignShow {get;set;}
    public boolean showAlert {get;set;}
    public boolean showAlert1 {get;set;}
    public boolean cmdCancelLeaveShow  {get;set;}
    public boolean cmdCancelShow {get;set;}
    public boolean requiredSection {get;set;}
    public string strComment {get;set;}
    //@Standard controller defination
    public _Leaveplan_CTE(Apexpages.standardcontroller controller){
        refreshPage = false;
        showAlert = false;
        showAlert1 = false;
        cmdCancelLeaveShow = true;
        requiredSection = false;
        this.leaveIds = (Leave_Plan__c) controller.getRecord();
        //@fetching complete record details from standard UI to class based on Id
        leaveDetail = [select id,name,Company__c,Current_Approval_Status__c,Date_From__c,Date_To__c,
                      Email_Id__c,Employee_ID__c,Employee_Name1__c,First_Approval__c,Description__c,
                      Leave_Type__c,Location__c,Manager_Approval__c,Number_of_Days__c,Request_Submitted_on__c,
                      Status__c,Time_out_of_office__c,Employee_Name__c from Leave_Plan__c where id =:leaveIds.id limit 1];
    }
    //@This method will call at the time of user clicks on submit for approval process button
    public pageReference cmdSubmitforApproval(){
        cmdCancelLeaveShow = true;
        User usr = [select id,name,userroleid,UserRole.Name from user where userroleid=:UserInfo.getUserRoleId() limit 1];
        Leave_Plan__c l = new Leave_Plan__c();
        l = [select id,status__c from Leave_Plan__c where id=:leaveDetail.id];
        if(l.status__c == 'Approval Pending'){
           // ApexPages.Message msg = new ApexPages.Message(ApexPages.Severity.Info, 'Your Lead is sent to Approval process already.');
            //ApexPages.addMessage(msg);
            showAlert = true;
            return null;
        }
        if(usr.UserRole.Name.contains('Employee')){
        try{
         Approval.ProcessSubmitRequest req1 = new Approval.ProcessSubmitRequest();
           req1.setObjectId(leaveIds.id);
           Approval.ProcessResult result = Approval.process(req1);
           refreshPage = true;
           }catch(Exception e){
               ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR, 'Error occured' + e.getMessage()));
           }
        return null;
        }else{
            showAlert1 = true;
            return null;
        }
    return null;
    }
    //@Method: This will call and display Approve or Reject buttons based on user group membership
    public void approvalNeeded(){
        cmdCancelLeaveShow = true;
        map<Id,Group> mapIdGroup = new map<Id,Group>([SELECT Id from Group where RelatedId = : UserInfo.getUserRoleId()]);
                    LIST < GroupMember > actList = [SELECT GroupId from GroupMember where UserOrGroupId =: UserInfo.getUserId() OR
                                             UserOrGroupId IN : mapIdGroup.keySet()];
                    set<Id> actId = new set<Id>();
                    if (actList.size() > 0) {
                        for(GroupMember g:actList){
                            actId.add(g.GroupId);
                        }
                    }

                    Integer i = [SELECT count()
                        FROM ProcessInstanceWorkItem
                        WHERE ProcessInstance.Status = 'Pending'
                        AND ProcessInstance.TargetObjectId = : leaveIds.Id AND(ActorId IN : actId OR ActorId = : UserInfo.getUserId())
                        LIMIT 1
                    ];

                    if (i > 0) {
                        approveShow = true;
                        rejectShow = true;
                        reassignShow = true;
                    } else {
                        approveShow = false;
                        rejectShow = false;
                        reassignShow = false;
                    }
    }
    //@Method:This method will call at the time of user clicks on Approval button
    public pageReference cmdApprove(){
        cmdCancelLeaveShow = true;
        Set<id> actId = new Set<Id>();
        //@Fetching group membership here
        map<Id,Group> mapIdGroup = new map<Id,Group>([SELECT Id from Group where RelatedId = : UserInfo.getUserRoleId()]);
        List<GroupMember > grp = [SELECT GroupId from GroupMember where UserOrGroupId =: UserInfo.getUserId() OR
                                  UserOrGroupId IN : mapIdGroup.keySet()];
        for(GroupMember g : grp){
            actId.add(g.GroupId);
        }
        List <ProcessInstanceWorkItem> items = [select id,processinstanceid,processinstance.status,processinstance.targetobjectid,ActorId from ProcessInstanceWorkitem
            where processinstance.status='Pending' and
            processinstance.targetobjectid = :leaveIds.id AND(ActorId = :UserInfo.getUserId() or ActorId=:actId ) limit 1];
            Approval.ProcessWorkitemRequest req = new Approval.ProcessWorkitemRequest();
            req.setAction('Approve');
            req.setComments('Approved Happy vacation');
            req.setWorkitemId(items[0].Id);
            Approval.ProcessResult result = Approval.process(req);
            refreshPage = true;
    return null;  
    }
    //@Method : This method will call at the time of Lead or Manager clicks on reject button
    public pageReference cmdReject(){
        try{
        cmdCancelLeaveShow = true;
        Set<id> actId = new Set<Id>();
        map<Id,Group> mapIdGroup = new map<Id,Group>([SELECT Id from Group where RelatedId = : UserInfo.getUserRoleId()]);
        List<GroupMember > grp = [SELECT GroupId from GroupMember where UserOrGroupId =: UserInfo.getUserId() OR
                                  UserOrGroupId IN : mapIdGroup.keySet()];
        for(GroupMember g : grp){
            actId.add(g.GroupId);
        }
        List <ProcessInstanceWorkItem> items = [select id,processinstanceid,processinstance.status,processinstance.targetobjectid,ActorId from ProcessInstanceWorkitem
            where processinstance.status='Pending' and
            processinstance.targetobjectid = :leaveIds.id AND(ActorId = :UserInfo.getUserId() or ActorId=:actId ) limit 1];
            Approval.ProcessWorkitemRequest req = new Approval.ProcessWorkitemRequest();
            req.setAction('Reject');
            req.setComments('Rejected adjust your days');
            req.setWorkitemId(items[0].Id);
            Approval.ProcessResult result = Approval.process(req);
            refreshPage = true;
            }catch(Exception e){
                ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR, 'Error occured' + e.getMessage()));
            }
    return null;  
    }
    //@Method:This method will refresh standard and custom UI
    public pageReference cmdCancel(){
        refreshPage = true;
    return null;
    }
    //@Method : Re-request will happen here
    public pageReference cmdRerequest(){  
     try{
     User usr = [select id,name,userroleid,UserRole.Name from user where userroleid=:UserInfo.getUserRoleId() limit 1];
     if(usr.UserRole.Name.contains('Employee')){}
     cmdCancelLeaveShow = true;
     Leave_Plan__c l1 = new Leave_Plan__c();
        l1 = [select id,status__c,Date_From__c,Date_To__c,First_Approval__c,Manager_Approval__c,
            Current_Approval_Status__c from Leave_Plan__c where id=:leaveDetail.id limit 1];
            l1.status__c = 'New Request';
            l1.Date_From__c = null;
            l1.Date_To__c = null;
            l1.Time_out_of_office__c = null;
            l1.First_Approval__c = false;
            l1.Manager_Approval__c = false;
            l1.Current_Approval_Status__c = '';
            Database.update(l1);
            refreshPage = true;
       }catch(Exception e){
           ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR, 'Error occured' + e.getMessage()));
           refreshPage = true;
       }      
     refreshPage = true;
     return null;
    }
    //@Method:method re-assignment will be done here
   public PageReference Reassign(){
       try{
        cmdCancelLeaveShow = true;
        List<ProcessInstanceWorkItem> workItemList = [Select p.ProcessInstance.Status, p.ProcessInstance.TargetObjectId,p.ProcessInstanceId,p.OriginalActorId,p.Id,p.ActorId
        From ProcessInstanceWorkitem p where p.ProcessInstance.TargetObjectId = :leaveIds.Id];
        Leave_Plan__c l = new Leave_Plan__c();
        l = [select id from Leave_Plan__c where id=:leaveDetail.id limit 1];
        String retId =l.id;
        String strAppId = workItemList[0].Id;
        String partialURL = '/' + strAppId + '/e?et=REASSIGN&retURL=%2F'+retId;
        PageReference pageRef = new PageReference(partialURL);
        refreshPage = true;
        return pageRef;
        }catch(Exception e){
            ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,''+ e.getMessage()));
        }
        return null;
        }
    //@Method:It will cancel leaves and leave process will end here
    /*public Pagereference cmdCancelLeave(){
        try{
     
       Set<id> actId = new Set<Id>();
        map<Id,Group> mapIdGroup = new map<Id,Group>([SELECT Id from Group where RelatedId = : UserInfo.getUserRoleId()]);
        List<GroupMember > grp = [SELECT GroupId from GroupMember where UserOrGroupId =: UserInfo.getUserId() OR
                                  UserOrGroupId IN : mapIdGroup.keySet()];
        for(GroupMember g : grp){
            actId.add(g.GroupId);
        }
        if(leaveDetail.status__c == 'Approval Pending'){
        List <ProcessInstanceWorkItem> items = [select id,processinstanceid,processinstance.status,processinstance.targetobjectid,ActorId from ProcessInstanceWorkitem
            where processinstance.status='Pending' and
            processinstance.targetobjectid = :leaveIds.id AND(ActorId = :UserInfo.getUserId() or ActorId=:actId ) limit 1];
            Approval.ProcessWorkitemRequest req = new Approval.ProcessWorkitemRequest();
            req.setAction('Reject');
            req.setComments('Cancelled apply for new leave');
            req.setWorkitemId(items[0].Id);
            Approval.ProcessResult result = Approval.process(req);
            }
            Leave_Plan__c l = new Leave_Plan__c();
            l = [select id,status__c,recordtypeid from Leave_Plan__c where id=:leaveDetail.id limit 1];
            l.status__c = 'Cancel';
            l.First_Approval__c = false;
            l.Manager_Approval__c = false;
            l.recordtypeid = '012280000005BKGAA2';
            Database.update(l);
            refreshPage = true;
            reassignShow = false;
            approveShow = false;
            rejectShow = false;
            cmdCancelLeaveShow = false;
            cmdCancelShow = false;
            }catch(Exception e){
                ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,''+ e.getMessage()));
            }
    return null;  
    }*/
    //@Method:It will cancel leaves and leave process will end here
    public Pagereference cmdCancelLeave(){
        ObjectRecordTypeIds__c orgConstant = ObjectRecordTypeIds__c.getInstance();
        String closedLeaveRecordtypeId = orgConstant.Marketing_Lead_RecordType__c;
        try{
        if(leaveDetail.status__c == 'Approval Pending'){
        List <ProcessInstanceWorkItem> items = [select id,processinstanceid,processinstance.status,processinstance.targetobjectid,ActorId from ProcessInstanceWorkitem
            where processinstance.status='Pending' and processinstance.targetobjectid = :leaveIds.id limit 1];
            Approval.ProcessWorkitemRequest req = new Approval.ProcessWorkitemRequest();
            req.setAction('Reject');
            req.setComments(strComment);
            req.setWorkitemId(items[0].Id);
            Approval.ProcessResult result = Approval.process(req);
            }
            Leave_Plan__c l = new Leave_Plan__c();
            l = [select id,status__c,First_Approval__c,Manager_Approval__c,recordtypeid,Cancel_Reason__c from Leave_Plan__c where id=:leaveDetail.id limit 1];
            l.status__c = 'Cancel';
            l.First_Approval__c = false;
            l.Manager_Approval__c = false;
            l.Cancel_Reason__c=strComment;
            l.recordtypeid = ObjectRecordTypeId__c.getInstance('Closed Leave').Marketing_Lead_RecordType__c;
            Database.update(l);
            refreshPage = true;
            reassignShow = false;
            approveShow = false;
            rejectShow = false;
            cmdCancelLeaveShow = false;
            cmdCancelShow = false;
            }catch(Exception e){
                ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,''+ e.getMessage()));
            }
    return null;  
    }
    public pagereference cmdCancelRequest(){
    requiredSection = true;
    reassignShow = false;
    approveShow = false;
    rejectShow = false;
 
    return null;
    }
    public List<SelectOption> getOptions(){
        List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Adjust your days','Adjust your days'));
        options.add(new SelectOption('Cancelled no requalification','Cancelled no requalification'));
        options.add(new SelectOption('Cancel your request','Cancel your request'));
        options.add(new SelectOption('Something went wrong on dates','Something went wrong on dates'));
        options.add(new SelectOption('Dont plan this week','Dont plan this week'));
        return options;
    }
    //@Method : Invoke apex method at the time of user clicking send to leaves button
    public pagereference cmdSendLeave(){
        User usr = [select id,name,userroleid,UserRole.Name from user where userroleid=:UserInfo.getUserRoleId() limit 1];
     if(usr.UserRole.Name.contains('Employee')){}
     cmdCancelLeaveShow = true;
       
     Leave_Plan__c l1 = new Leave_Plan__c();
        l1 = [select id,status__c,Date_From__c,Date_To__c,First_Approval__c,Manager_Approval__c,
            Current_Approval_Status__c from Leave_Plan__c where id=:leaveDetail.id limit 1];
            //Map<string,ObjectRecordTypeId__c> orga =ObjectRecordTypeId__c.getAll();
            //if(orga.containsKey('Closed Leave')){
            //l1.recordtypeId = orga.get(l1.id).name;
            //}
            l1.status__c = 'send to report';
            l1.Date_To__c = null;
            l1.Time_out_of_office__c = null;
            l1.First_Approval__c = false;
            l1.Manager_Approval__c = false;
            l1.Current_Approval_Status__c = '';
            Database.update(l1);          
            refreshPage = true;
            requiredSection = true;
            reassignShow = false;
            approveShow = false;
            rejectShow = false;
     return null;  
    }
    public static void deletePreventTriggerMethod(List<Leave_Plan__c> leaveIds){
        User currentUserRole = [select id,profileid,profile.name from User where id=:UserInfo.getUserId() limit 1 ];
        if(!currentUserRole.profile.name.contains('System Administrator')){
        for(Leave_Plan__c leaveId : leaveIds){
            leaveId.addError('You are not an authorized to delete this record contact your Admin');
        }
     }
   }
}