Scrollbar in a ButtonSelect Control

I have a layout in which I have attached a URL with a ribbon. In myRibbon I added a ButtonSelect control.
Like this:

But when I display the complete Select Control appears a scrollbar in my layout:

How can I get the scrollbar in the ButtonSelect Control and no in the Layout?

Thank you!!!
(Sorry for my English)


Could you please provide us complete demo including all correspondnig js/css files?
Please also add information regarding current and expected behaviour.

Here is a small guide how to make a complete demo: … pport.html

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