code: function(oList){
  		var jListContRef = oList.$("lst");
  		if (jListContRef.hasClass("sapUiUx3ExactLstExpanded")) {
  			//collapse
  			oList._oPopup.close();
  		} else {
  			//expand
  			oList._oPopup.open();
  		}
  	}
docs: Toggles the vertical Collapse State