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

 public boolean OutlineCollapsed{ get; set; }

Public Property OutlineCollapsed() As Boolean


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


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