I openned a support ticket and they suggested a slightly different approach whic i have adjusted to suit my needs.
I placed each button group in a placeholder and gave each button a command name. Now i can have multiple toggle button groups and when the form submit occours i just call the following method passing the placeholder and in return i get the CommandName of the checked button -:
String GetCheckedCommand(PlaceHolder holder)
RadButton rb = (RadButton)btn;
Hope tihis helps people.