code: public void setDisabled(boolean disabled) {
  		this.disabled = disabled;
  		if (disabled) {
  			handlerManager.fireEvent(new ToolbarActionDisabledEvent());
  		} else {
  			handlerManager.fireEvent(new ToolbarActionEnabledEvent());
  		}
  	}
docs: Is the button for this action disabled or not?
  
  @param disabled
  The new value