Reads good so far

Were it possible to make the event-callback-functions to receive the user-property of the controls?

For example I have some images to display and I give all image-controls the same name and every image-control an index-number -
could be stored in the user-slots
(Control Set User...)-
Now assumed one of the images gets clicked and within the events callback I want to know the images index:

Callback Function myimage_OnLeftButtonDown(Optional Userdata(4) As Long) As Long
Or is there another way to retrieve the desired data stored at the control?