Design Studio OnClick event not triggering on sapui5 component

I am trying to extend the sapui5 table component. Was not able to fire the design studio onClick event.  Can anybody explain me? how to get this done.

my js file:

initDesignStudio : function() {  // Called by sap.designstudio.sdkui5.Handler  (sdkui5_handler.js)  },  init : function() {  sap.ui.table.Table.prototype.init.apply(this,arguments);  },  clickHandler : function(){  this.fireDesignStudioEvent("onclick");  }

in contribution.xml: