@UiHandler("btnYoutube")
 void onYoutubeClick(ClickEvent event) {
   if (youtubeClickHandler != null) {
     youtubeClickHandler.onClick(event);
   }
 }
 @UiHandler("btnEdit2")
 void onEdit2Click(ClickEvent event) {
   if (edit2ClickHandler != null) {
     edit2ClickHandler.onClick(event);
   }
 }