Global keycapture

I have to create a dll/ocx that notifies the owner when a keypress occurs. This shall happen even if the ownerwindow haven't got the focus.
I've created an ocx, raising an event if a key was pressed. This works fine when i open the ocx in "ActiveX control test container" The problem is that the event doesn't fire when used from a VB/VFP program, any suggestions?

Code:

void getKey(void *data){
	CKeyCapCtrl *dat1 = (CKeyCapCtrl*)data;
	static int iLastKey(0);

	while(dat1->running){
		for(int i=1;i<256;i++){
			if(GetAsyncKeyState(i) && i != iLastKey){
				dat1->sendKey(i);
				iLastKey = i;
				break;
			}
		}
		Sleep(100);
	}

	_endthread();
}