This class encapsulates the data for the ToolBar.ButtonClick event. You can determine which Button caused the event. public class ToolBarButtonClickEventArgs : EventArgs { // Public Constructors public ToolBarButtonClickEventArgs (ToolBarButton button ); // Public Instance Properties public ToolBarButton Button {set; get; } } HierarchySystem.Object System.EventArgs ToolBarButtonClickEventArgs Passed ToToolBar.{OnButtonClick() , OnButtonDropDown()} , ToolBarButtonClickEventHandler.{BeginInvoke() , Invoke()} |