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Opening a link in new tab in lightning opening only the Vf page not the complete page

Hi All,
     I have a inline Vf page in Account detail page.In that i have a field value as a link to custom detail page using code below
 <apex:form >            
    <apex:commandLink action="/{!IF((account.SumId != null),account.SumId__c,account.Id)}" value="{!IF((account.ParentId !=  null),account.Parent.Firmname__c, account.Firmname__c)}" target="_parent"/>        
when i open that link in new tab in lightning it is only opening that vfpage not the complete detail page.
The screeshot as followsUser-added image

what is the solution for this?