[gtkmm] How to set a button back to its released(?) state?

[mmagallo debian org]

Hi,

 I'm writing an application where there are two buttons.  If one of the
 buttons is in the released (default) state, the other has to be made
 non-sensitive _and_ released, too.  In time it would for example like
 this (P = pressed, R = released, S = sensitive, N = non-sensitive)

    [ R, N ]  [ R, N ]

    [ R, S ]  [ R, N ]

    [ P, S ]  [ R, S ]

    [ P, S ]  [ P, S ]

    [ R, S ]  [ R, N ]

 In the last step, I can get the button to the non-sensitive state by
 calling button.set_sensitive(false), but I can't get it to the released
 state.  Something like:

    if (button.get_active())
        button.clicked();

 does it, with the side effect that it triggers the clicked signal,
 which I don't necessarely want to happen.

 Is there a better way?

 TIA,

-- 
Marcelo