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You can specify a System.Windows.Forms.ContextMenu to be displayed when the drop-down button is clicked. This property is not used unless the ToolBarButton.Style property value is set to ToolBarButtonStyle.DropDownButton.
Although the ToolBarButton.DropDownMenu property is defined as a System.Windows.Forms.Menu type, you must assign it a System.Windows.Forms.ContextMenu for it to display properly. If you are creating your own System.Windows.Forms.MenuItem derived class you must assign that object to a System.Windows.Forms.ContextMenu and assign the System.Windows.Forms.ContextMenu to the ToolBarButton.DropDownMenu property.