Scrolling in virtualized WPF TreeView is very unstable

Question

If virtualizing is enabled in TreeView with items having various sizes, multiple problems appear:

• Vertical scroll bar changes its size randomly and

Answer 1

To make the link more prominent, I am posting it in an answer too. It looks like a bug is within the framework code and there are no workarounds found yet. I have reported the bug on Microsoft Connect:

Microsoft Connect: Scrolling in virtualized WPF TreeView is very unstable

There is also a maybe related bug which was posted in the comments by @sixlettervariables:

Microsoft Connect: WPF application freezes while scrolling the TreeView under specific conditions

If you can reproduce the bugs, please vote them up.