Radio button in two different blocks in the selection screen

Hi folks,

In my selection screen i have two selection blocks. First block to create a new document no, second block to display the list of the created document numbers.User has to go any one of that..can i keep first radio button in the first selection block and the second radio button in the second block...I have already tried..but its not allowing..is this possible..if so please suggest me how...

Thanks,

Shyam.