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function test_radiobutton_callback(action) 
 
switch action 
case 'rb1' 
   Hndl = findobj(gcbf,'Tag','Label1'); 
   set (Hndl,'String','Option 1'); 
   Hndl = findobj(gcbf,'Tag','radiobutton1'); 
   set (Hndl,'Value',1); 
   Hndl = findobj(gcbf,'Tag','radiobutton2'); 
   set (Hndl,'Value',0); 
   Hndl = findobj(gcbf,'Tag','radiobutton3'); 
   set (Hndl,'Value',0); 
 
case 'rb2' 
   Hndl = findobj(gcbf,'Tag','Label1'); 
   set (Hndl,'String','Option 2'); 
   Hndl = findobj(gcbf,'Tag','radiobutton1'); 
   set (Hndl,'Value',0); 
   Hndl = findobj(gcbf,'Tag','radiobutton2'); 
   set (Hndl,'Value',1); 
   Hndl = findobj(gcbf,'Tag','radiobutton3'); 
   set (Hndl,'Value',0); 
 
case 'rb3' 
   Hndl = findobj(gcbf,'Tag','Label1'); 
   set (Hndl,'String','Option 3'); 
   Hndl = findobj(gcbf,'Tag','radiobutton1'); 
   set (Hndl,'Value',0); 
   Hndl = findobj(gcbf,'Tag','radiobutton2'); 
   set (Hndl,'Value',0); 
   Hndl = findobj(gcbf,'Tag','radiobutton3'); 
   set (Hndl,'Value',1); 
 
end