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Gets or sets whether images are displayed in the outline column.
When this property is enabled, the outline column can show the level images configured through Images for hierarchical rows.
bool ShowImage { get; set; }
Property ShowImage 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;
outlineColumn.ShowImage = true;
bool showImage = outlineColumn.ShowImage;