Moving Focus Between Form

Hi I am new to Mono, and I not sure this is a right place to ask this question:

1.       I am trying to port a C# Windows app to Mono running on SLES 10.1. ; The app starts with one form, and base on user input , it can launch other forms.  When this happens, the new form gets focus, and I can click on the previous form (parent?), and get focus.  On mono, the app behaves differently:  I cannot get focus back to the previous, unless I close the new form.

Any help on this matter would be appreciated.

Thanks.

-Tri.