How to control visibility of Plus/Minus Cell?

The ShowRecordPlusMinus property in TableOptions indicates whether a PlusMinus symbol should appear or not to the records. Please refer the below code snippet which avoids the Plus/Minus symbol for the parent table:

this.GridGroupingControl1.TableOptions.ShowRecordPlusMinus = false;

Me.GridGroupingControl1.TableOptions.ShowRecordPlusMinus = False