次のサンプルコードは、GroupBarInfoプロパティを設定します。
FarPoint.Win.Spread.GroupBarInfo gb = new FarPoint.Win.Spread.GroupBarInfo();
gb.BackColor = Color.Red;
gb.Visible = true;
fpSpread1.Sheets[0].GroupBarInfo = gb;
Dim gb As New FarPoint.Win.Spread.GroupBarInfo()
gb.BackColor = Color.Red
gb.Visible = True
FpSpread1.Sheets(0).GroupBarInfo = gb