>How can I know if an specific control has the focus.

type('thisform.activecontrol.name') = 'C' and thisform.anobject = thisform.activecontrol

The above should be true if 'AnObject' has focus. I'm not sure if that will work by itself or you will need to use CompObj() to compare the objects. Notice that you can't jsut compare the Name properties because of containership.