I am copying the answer from your support ticket here as well, so the community can benefit from it:
It seems that you have a general programming question that is not related with our controls. A quick search returned the following thread, which explains how you can do that: http://stackoverflow.com/questions/3752860/c-sharp-how-to-force-a-slpash-screen-to-be-shown-in-the-primary-display-in-a-dua.
I hope that you find this useful.
the Telerik team