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Gets or sets whether the group box uses 3D style.
Returns true if 3D shading is displayed for the group box; otherwise, false.
bool Display3DShading { get; set; }
Property Display3DShading As Boolean
IGroupBox groupBox = worksheet.Controls.AddGroupBox(20, 20, 140, 80);
groupBox.Text = "Priority";
groupBox.Display3DShading = true;
bool display3DShading = groupBox.Display3DShading;