code: function _deletePanel( oPanel, bDestroyLayout ) {
  
  		oPanel.setLayout(null);
  		oPanel.setContainer(null);
  
  		if (!bDestroyLayout || !oPanel.getParent()) {
  			// if in real control tree let the ManagedObject logic destroy the children
  			oPanel.setContent(null);
  			oPanel.destroy();
  		}
  
  	}
docs: /*
  clear content before delete panel