Userform has mind of its own

[LarryJNX]

Hi. I have a userform with both vertical and horizontal scroll bars on it. When the form opens, the scroll bars are in their upper-most and left-most positions, which is where I want them to be. But when I click on a combo box in the upper left corner to begin filling out the form, it spontaneously scrolls to the bottom of the form. I have to scroll bar back up to the top to get back to my combo box. Is there a property that controls this? Anybody know why this is happening? And what I can do to make it stop?
Thanks in advance.
Larry