Question

I have a very simple WPF user control that is mixed in with a windows forms app. It has a list box that renders its scroll bar without the thumb (image below). I narrowed it down to a plugin in my app that uses Managed DirectX (MDX). If I remove the plugin, the scroll bar is just fine. I know MDX is deprecated, but I don’t think today is the day to consider an upgrade. Has anyone ever seen their scroll bar get messed up, or has any idea what I should do?

And I should add, that this control also lives in a plugin. There is no way for the 2 plugins to reference each other.

<UserControl x:Class="MAAD.Plugins.Experiment.Visual.TestEditor"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="403" Width="377">
<ListBox Margin="12" Name="listBox1" />
</UserControl>

Update: You can read about the solution below.

Answer 1

As it turns out, I stumbled on the solution today while working with a client. If you add the CreateFlags.FpuPreserve flag to your device creation, the scrollbar should go back to normal.