The first two groups are collapsed, and a "+" is shown at the left side of group name.
Then I draged the scroll bar at the right side.
then comes the problem:
------------
the 1st group, which is collapsed, is been scrolled!
------------
The problem can be confirmed with MultiCharts .NET Version 8.8 Beta 2 (Build 8071), or Version 8.7, in a 32bit Windows 7 destop PC.