You can handle the Keyboard key down events, and check if the key is Ctrl, to raise a boolean flag indicating the state of the button. You should subscribe tot he event with HandledEventsToo set to true, since something may be handling them in the process.
Hope this helps!
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for WPF.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>