Horizontal scrollbar in VB6 (XP) weird behaviour

I have two horizontal scrollbars on a form, each in a different frame. When I click on the scroll arrow it keeps scrolling. I have some code in the Change event that sets a textbox value.

The problem only appeared when I added the second scrollbar and I have another form with 8 scrollbars and no problems.

One thing: there is a Smartui Tabstrip on the form at the left (vertical). Sometimes when the weird behaviour starts and I keep clicking the frames move over and cover the Tabstrip.
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To prevent that the frames cover the Tabstrib send a ZOrder command to the Tabstrib, like this:

Tabstrib1.ZOrder (0)

Then, the Tabstrib moves to the foreground.

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Visual Basic Classic

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