Programmatically raise a command
Not sure if you mean:
if(MyButton.Command != null){ MyButton.Command.Execute(null);}with c#6 and later (as proposed by eirik) there is the short form:
Mybutton.Command?.Execute(null);Update
As proposed by @Benjol, providing the button's CommandParameter-property value can be required in some situations and the addition of it instead of null may be considered to be used as the default pattern:
Mybutton.Command?.Execute(MyButton.CommandParameter);
Or if you don't have access to the UI element you can call the static command directly. For example I have a system wide key hook in App.xaml and wanted to call my play/pause/stop etc media events:
CustomCommands.PlaybackPlayPause.Execute(null, null);passing 2nd parameter as null will call all attached elements.