Do I need to add this implementation by my self sub classing the radiobutton control?

------------------------------------------------------------------------
I would like to change the world, but they don´t give me the source code.
MS Windows 7 Ultimate 64-Bit
Intel(R) Core(TM)2 Quad CPU Q9300 2.50 GHz
6.00 GB of RAM, NVIDIA GeForce 9800 GT

MacBook Pro i5 OSX Lion

Ivan is correct, you will want to use the RadioGroup instead of the Radio button.  The RadioGroup has the implementation and is to what you will want to bind your BO.