Hi Mahesh,
There is one more way, but you have to write more code and that will also access private aggregation. Here is it:
var oSplitApp = this.getView().byId("oSplitApp"); //Get Hold of SplitApp
var oPage = oSplitApp.getCurrentPage();
var oPageHeader = oPage.getAggregation("_internalHeader");
var oHeaderButton = oPageHeader.getContentLeft()[0];Regards,
Sai Vellanki.