Vista - [beginner] ApplicationCommands.Copy, I don't get it!

I try to discover and play with WPF.
I "designed" a very simple GUI with Orcas C# express, with 1 button and 1
text box.
then, in the windows constructor, after InitializeComponent() I added:

butPaste.Command = ApplicationCommands.Paste;


now I don't get it, the button is always gray.
I have a book which tell me to bind delegate to the Execute(), CanExecute()
method but.. how do I know that the focused text change has changed or such
things?

I though that one benefit of action was automatic tracking of the focused
component and its parent to automatically enable / disbale actions....

if it doesn't how do I track it?

I guess I can try something with the bubbling
GotFocusEvent

at the top level form.....

any idea?

"Lloyd Dupont" <net.galador@ld> wrote in message
news:OjoFw0ulHHA.208@TK2MSFTNGP05.phx.gbl...
>I try to discover and play with WPF.
> I "designed" a very simple GUI with Orcas C# express, with 1 button and 1
> text box.
> then, in the windows constructor, after InitializeComponent() I added:
>
> butPaste.Command = ApplicationCommands.Paste;
>
>
> now I don't get it, the button is always gray.
> I have a book which tell me to bind delegate to the Execute(),
> CanExecute() method but.. how do I know that the focused text change has
> changed or such things?
>
> I though that one benefit of action was automatic tracking of the focused
> component and its parent to automatically enable / disbale actions....
>
> if it doesn't how do I track it?
>