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If True, adds a horizontal scrollbar to the DesktopListBox.
The horizontal scrollbar only appears if the sum of the widths of the columns exceeds the width of the ListBox itself. If the widths of the columns is less than (or matches) the width of the DesktopListBox, then no horizontal scrollbar appears.
The position of the thumb is indicated by ScrollPositionX. It is used to scroll the DesktopListBox horizontally without a separate DesktopScrollbar control.