Thank you for writing and for the attached screen shot.
You have to either anchor the RadPageView or dock it in its parent form in order for it to resize when you resize your form. Can you please check if you have done so, because there is no other obvious reason for this behavior.
I am looking forward to your response.
All the best,
the Telerik team
Q1’11 SP1 of RadControls for WinForms is available for download
; also available is the Q2'11 Roadmap
for Telerik Windows Forms controls.