Sets or returns whether the column's outlined column group is collapsed. If the outline is collapsed, the column is hidden.

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 public boolean OutlineCollapsed{ get; set; }
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<p>Public Property OutlineCollapsed() As Boolean</p>

          bool collapsed = colProps.OutlineCollapsed;
          colProps.OutlineCollapsed = true;
        

          Dim collapsed As Boolean = colProps.OutlineCollapsed
          colProps.OutlineCollapsed = True