Megatron is going to hate this...but
log onto http://www.planetsourcecode.com go to the vb zone and do a search on gif89. A number of copies reside there as well as a few replacement controls. Normally you can download a demonstration project (in zip format) with the control, and this may help. Have you looked at the properties of your control, may be as Meg says that version does not support this event.
I am pretty sure they are relevant copies..
Just the same dll they are..
Try planetsourcecode and see what you can find
Sorry l don't have the individual urls but do the search and you should get six or so postings. At least one uses a replacement for gif89.