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ComboBoxAdv does not drawn properly when a GroupBox is present

If a GroupBox control is present on a Window, any ComboBoxAdv controls created after the GroupBox will not draw properly when not in focus. See the following screenshot for details.

Empty


The ComboBoxAdv control on the 1st row is drawn properly in Fluent Light theme.

The first ComboBox control within the GroupBox is a standard Microsoft control included here for comparison.

Please note that the 2nd ComboBoxAdv control within the GroupBox is drawn with extra gray horizontal lines. The 3rd ComboBoxAdv control after the GroupBox is also not drawn properly.

I have included a test project to demonstrate the display issue.