ComboBox

            base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);

            ComboBox comboBox = (ComboBox)base.DataGridView.EditingControl;
            if (comboBox != null)
            {
                comboBox.DropDownStyle = ComboBoxStyle.DropDown;
                comboBox.AutoCompleteMode = AutoCompleteMode.Suggest;
                comboBox.Validating += new CancelEventHandler(comboBox_Validating);
            }

create_shape_model (ImageReduced, 4, rad(0), rad(360), 'auto', 'auto', 'use_polarity', 30, 10, ModelID)