Thank you for contacting us.
As you already mentioned the scrollbars of RadDock's DocumentWindow currently cannot be themed.
Using a RadScrollablePanel docked in the DocumentWindow would probably be the easiest workaround. To hide its border and fill please use the following lines of code:
.radScrollablePanel1.PanelElement.Border.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
.radScrollablePanel1.BackColor = Color.Transparent;
I hope you find my answer useful. Let me know if you have further queries.
the Telerik team
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