The RadDock is an INamingContainer, which means that the form
of the page and the button control in the dock will not be in the same INamingContainer, and the form cannot find the button set as DefaultButton. That's why you should pass the UniqueID of the button the the DefaultButton property, in the code behind, i.e.:
sender, EventArgs e)
form1.DefaultButton = btLogin.UniqueID;
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!