Ctrl Property (MouseEventArgs)
Gets a value specifying whether the control (CTRL) key was down when the event occurred.
This property cannot be used in XAML.
value = eventargs.Ctrl
true if the CTRL key was down when the event occurred; otherwise, false.
This property is read/write, but should be considered read-only because there is no reason to change the reported information. There is no default.
If the value of this property is true, there will also be a relevant keyboard event, which may not match the exact timing of the mouse event. This property reports the key state that existed when the mouse event occured.