MouseLeave event fires when moving over control's ScrollBar
问题 I am reposting this question due to inability to solve the problem (original here). In the TreeView, ListBox, or it seems from my google searches anything with a ScrollBar, the ScrollBar is not considered a part of the control. I have a TreeView that I'm putting into a custom control, and it's Dock Fill. So there it acts as a custom TreeView which has all our logic to manage it in one place. In parts of our program we slide it out based on a MouseEnter event, and slide it back in on a