Click on Command Button does not COMMIT

Hi,

I have a single Command Button on an UIR embedded in a dll which I call from TestStand. The button does nothing when trying to click in any way, but when I press <Enter> or <Spacebar> it works just fine. Can someone tell why this is happening?

int CVICALLBACK TERMINATE_BUTTON (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:

//event action

break;

case EVENT_LEFT_CLICK:

//event action

break;

case EVENT_LEFT_CLICK_UP:

//event action

break;

}
return 0;
}

Thanks in advace,

JulianC