I have not heard back yet on Post #29538 which my client is very concerned about. Hear is some additional help:

I create a new SF project with 1 form. Put a System.Windows.Forms.TextBox and a System.Windows.Forms.MaskedTextBox on it. Did not use and bindings. Ran it. Entered text, then tried to use the DELETE key. It did not do anything. Then copied these 2 controls to the clipboard and created a new regular non SF System.Windows.Forms.Form and pasted these two controls on it and ran the form. The DELETE key does work there.

So this appears to be something going on in the SF Framework. PLEASE let me know if I need to do a work around or to just set my client's (Trusted) expectations. IE... I would think that the INSERT key should also work. This is an ongoing problem and I need to let me client know something.

Also, the post 29538 mentions an issue with using the backspace key on a numeric column that has a BO column. When clicked, a red data exception screen appears.

Please followup ASAP. Thanks