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Multiselect in Vertical Tabs --> 2 boxes below eachother

Project:Multiselect
Version:7.x-1.x-dev
Component:User interface
Category:feature request
Priority:normal
Assigned:Unassigned
Status:active

Issue Summary

I put a Multiselect in VerticalTabs, created via Field_group. This way the width of the widget is too wide, causing the two boxes to appear below eachother.
This only happens in IE8, not in Chrome or Firefox.
I use Bartik, with a menu in left-region, which makes the content-region smaller.

Is there a way to make the boxes smaller?