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Gets or sets whether check boxes are displayed in the outline column.
When this property is enabled, the outline column shows a check box for rows in the hierarchical display.
bool ShowCheckBox { get; set; }
Property ShowCheckBox As Boolean
worksheet.Range["A1:A3"].Value = new object[,] {{"Name"}, {"Node 1"}, {"Node 1.1"}};
worksheet.Range["A3"].IndentLevel = 1;
IOutlineColumn outlineColumn = worksheet.OutlineColumn;
outlineColumn.ColumnIndex = 0;
bool showCheckBox = outlineColumn.ShowCheckBox;