A query on GroupBox...

I have a form where-in I have 4 RadioButton options and based on each RadioButton selection I display a GroupBox where-in I have many controls inside it. So I have 4 different GroupBoxes for 4 RadioButtons. There will be only one GroupBox displayed at any time based on the RadioButton selection.

Now my query is... when I run the application the user definitely tends to see / click all the RadioButtons and see what's there inside and he may also click some controls inside it (For example I also have some RadioButton control inside the GroupBox and the user may just click or he may select some value from the list box control ...). So what I need is... when the user switches/selects from one RadioButton to another RadioButton all the other GroupBoxes except the corresponding one and it's controls had to be cleared/refreshed/reset.

Hope am clear. Please guide/help me out. Thank you!
My working environment is: VS2005(.Net 2.0) / SQL / VB / Windowsapp.