TextBox RaiseEvent KeyDownEvent does not work

Trying to raiseEvent to textBox - but i don't see the key value in the textBox text. I can see that the textbox event "OnKeyDownEvent" is stopping in breakpoints - but i don't understand why the text of the KeyEventArgs ( Key.D0 ) is not insert into the textbox text.

The code:


if( TextBoxInFocus != null )
{
KeyEventArgs k = new KeyEventArgs( Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, System.Environment.ProcessorCount, Key.D0 );

//KeyEventArgs k = new KeyEventArgs( Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.D0 );

k.RoutedEvent = UIElement.KeyDownEvent;

TextBoxInFocus.RaiseEvent( k );

k.RoutedEvent = UIElement.KeyUpEvent;

TextBoxInFocus.RaiseEvent( k );



}