Disabling scrollbar of Winform control inside WPF control

I have a WindowsFormsHost, with a Winform control in it, inside a WPF Tab item.

I've set the scrollbar to 'Hidden' on the Tab Control, the Tab Item itself, the WindowsFormsHost AND the Winform control inside the Host.

The scrollbars are still there, so at this point I'm not sure where they're coming from. I've also disabled the scrollbar on the entire window itself.

I have ScrollViewer.HorizontalScrollBarVisibility="Hidden" set on all the aforementioned controls.