Each time when the GridViewMaskeBoxColumn's cells leave edit mode, their values is decreased if percentage mask is used.


GridViewMaskBoxColumn maskBoxColumn = new GridViewMaskBoxColumn("Amount", "Amount");
maskBoxColumn.Mask = "P";
maskBoxColumn.MaskType = MaskType.Numeric;
maskBoxColumn.FormatString = "{0:0.00%;0.00%;none}";
this.radGridView1.Columns.Insert(2, maskBoxColumn);