Refresh Problem to Picture Box

I did some designs (gif file) which I used in a form as comands loaded obvious in picturebox. I've declared actions on mouse over to be changed from a imagelist control.
When I pass over the object the program is running well and the image is changing with the new picture

Problem: Durin my mouse move, over the picture box, refresh image very quickly and than disapear and the image remains good. How can I escape from that....?

I don't understand the problem. Can you rephrase it or post the project?

There is no problem with the code I got so far. I just switch image in picture box from a imagelist control. And that part is functioning well. When I run the program everything is going ok. But what I don't like is visual. It seems to appear a slight refreh problem when I pass over the pictures box that I got into the form.
I tried to catch a picture screen with that refresh problem over my buttons, but I can't they are showing unpredictible and very fast. Half hour I tried and nothing...