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

i have taken same error in wpf application while loading window. Visual Studio 2017 After some researching find out something like this post and i have noticed it is interesting WindowStyle element.

In my case the error in XAML design window in wpf and windows attribute value was

WindowStyle ="none"

i have changed it's value to WindowStyle ="SingleBorderWindow" and this errors has disappeared