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kEventControlHit and Check box

Hi,

I'm converting an old application to Carbon and I have a problem with Check box controls: In my Carbon event handler for kEventControlHit, I get the check box value, but the value I get is the value before the click, not after. I have the same code for Sliders, scrollbars, bevel buttons (with toggle behaviour) and Tabs controls and it works fine for all of these, just not for check boxes. Does anyone have any idea what I'm doing wrong? Here's the (simplified to protect the innocent) code:

void CheckBox::InstallEventHandler()
{
OSStatus status;
static const EventTypeSpec events[] = {
{ kEventClassControl, kEventControlHit },
};

static EventHandlerUPP event_handler_UPP = NULL;
if ( event_handler_UPP == NULL )
event_handler_UPP = NewEventHandlerUPP( EventHandler );
status = ::InstallControlEventHandler( GetControl(), event_handler_UPP,
GetEventTypeCount(events), events, this, NULL );
}

pascal OSStatus CheckBox::EventHandler(EventHandlerCallRef handlerRef, EventRef event, void* userData)
{
CheckBox *button = (CheckBox *)userData;
int value = ::GetControlValue( button->GetControl() ); // This returns the wrong value
::CallNextEventHandler(handlerRef, event); // adding this in makes no difference
value = ::GetControlValue( button->GetControl() );
return eventNotHandledErr;
}

Jerry
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