code: private boolean isIconTargetClicked() {
  		String targetHtml = EventHandler.getNativeMouseTarget().getString();
  
  		if (targetHtml.indexOf(ICON_EXTENSION) != -1) {
  			return true;
  		}
  
  		return false;
  	}
docs: Method that checks if the target html tag of mouse event contains given icon extension.
  Should be backwards compatible with smartgwt 3.1 where the source html tag is IMG.
  !Will probably not work on touch devices.
  
  @return if treenode icon is clicked.