If setting "Allow Scaling" to False, it would be nice it the ZoomComboBox is automatically hidden and the vertical scroll bar fills the space. When Allow Scaling is false, the user can still change the the zoom factor, but nothing happens which is confusing. Although setting SyntaxEditorElement.ZoomComboBox.Visibility to Collapsed does remove the ZoomComboBox, it does not cause the vertical scroll bar to fill the space resulting in slight strange looking UI.