GUI - Default value of the radio button group

Suppose I have created a button groups which contains 3 radio buttons. What is the default value of this group (i.e., the value that a radio button represents), or how could I set it NULL?

Answer 1

[Matt Fig]

The default should be the first button created.

G = uibuttongroup;
R(1) = uicontrol(G,'style','radio',...
                   'units','pix',...
                   'pos',[10 10 40 40]);
R(2) = uicontrol(G,'style','radio',...
                   'units','pix',...
                   'pos',[10 80 40 40]);
R(3) = uicontrol(G,'style','radio',...
                   'units','pix',...
                   'pos',[10 140 40 40]);
R==get(G,'selectedobject') % Find which one is selected
set(G,'selectedob',[]) % Set to none