Override the ToolStripComboBox.OnSubscribeControlEvents(Control) method to unsubscribe events subscribed in ToolStripComboBox.OnSubscribeControlEvents(Control).
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The ToolStripComboBox.OnUnsubscribeControlEvents(Control) method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.