Handling different radio buttons

I am writing a code that contains a figure with uicontrols such that two radio buttons are there (Temp in oF, and in oC). I'm havin' a trouble with switchin' the 2 buttons such that only one of them can be selected, can i make this without any button group or selection change fcn?

-If not, then how can be a selection change fcn can be written and what do its elements (new value, ... ) represent?

Here is a crop of the code

h.Rs=uibuttongroup('visible','off','Position',[0 0 .2 1]);

set(h.Rs,'SelectionChangeFcn',@Radio);
set(h.Rs,'SelectedObject',[]);  

h.R1=uicontrol('style','radiobutton','position',[60 160 75 25],'string','Temp in oF');

h.R2=uicontrol('style','radiobutton','position',[260 160 75 25],'string','Temp in oC');

...

function Radio

switch get(eventdata.NewValue,'Tag') 

      case 'h.R1'
          R1s=get(h.ET1,'string');Res1=str2num(R1s);
          T1s=get(h.ET2,'string');Temp1=str2num(T1s)
          T2s=get(h.ET3,'string');Temp2=str2num(T2s);
          Res2=Res1*((Temp1+6.77)/(Temp2+6.77));
          set(h.T5,'string',num2str(Res2)); 
      case 'h.R2'
          R1s=get(h.ET1,'string');Res1=str2num(R1s);
          T1s=get(h.ET2,'string');Temp1=str2num(T1s);
          T2s=get(h.ET3,'string');Temp2=str2num(T2s);
          Res2=Res1*((Temp1+21.5)/(Temp2+21.5));
          set(h.T5,'string',num2str(Res2)); 
  end
  end

Answer 1

[Sean de Wolski]

FEX:Matt's GUIs

Looks like gui_8