ICheckable | 
The ICheckableMenuCommand type exposes the following members.
| Name | Description | |
|---|---|---|
| CanExecuteChanged | Occurs when changes occur that affect whether or not the command should execute. (Inherited from ICommand)  | |
| IsCheckedChanged | Event that occurs when the checked state of the command changes. Warning: this is a weak event like ICommand.CanExecuteChanged! Subscribers need to ensure they keep a reference to the delegate alive. Implementers need to ensure they use a weak reference to the delegate. |