Change hardware keyboard layout from CF.net

Hi

I'm developing a CF.Net application.
In it I have several textboxes for numeric input only.

The problem is that when ever the user uses the hardware keyboard (which has a 10 digit numeric layout), it always inserts text into the textbox...
Eg. typing 3 inserts a 'd'

I have tried....
InputModeEditor.SetInputMode(this.txtSomeNumber, InputMode.Numeric);
... It does not work.

Though, if the users holds down the * a small list appears, where the users can choose between T9, ABC or 123 (Numeric)
If the user chooses 123, then the hardware keyboard inputs numeric values.

I want to be able to programmatically set the hardware keyboard to 123 or ABC
There has to be some p/invoke or likewise that can do this.... but how?

Details...
Device: HP iPaq 614c
OS: Windows Mobile 6 Professional
Runtime: Compact Framework 2.0

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