Thank you for writing.
The only thing that you have to do in order to show a form as a modal form is to call its ShowDialog
method instead of the Show
Form1 f =
I hope that you find this information helpful.
All the best,
the Telerik team
Q2’11 SP1 of RadControls for WinForms is available for download (see what's new); also available is the Q3'11 Roadmap for Telerik Windows Forms controls.