// Set datagrid ComboBox ColumnStyle for PubID field
DataTable tblCompanies = ds.Tables["Companies"];
TblStyle.GridColumnStyles.Add(new DataGridComboBoxColumn(ref tblCompanies, 1, 0, true, false, true));
// Datagrid ComboBox DisplayMember field has order number 1. Name of this column is "Name"
// Datagrid ComboBox ValueMember field has order number 0. Name of this column is "PubID"
TblStyle.GridColumnStyles[1].MappingName = "PubID";
TblStyle.GridColumnStyles[1].HeaderText = "Company ID";
TblStyle.GridColumnStyles[1].Width = 200;
TblStyle.GridColumnStyles[1].NullText = String.Empty;

.................................................

// Set datagrid DateTimePicker ColumnStyle for DateFirst field
TblStyle.GridColumnStyles.Add(new DataGridDateTimePicker());
TblStyle.GridColumnStyles[4].MappingName = "DateFirst";
TblStyle.GridColumnStyles[4].HeaderText = "Date";
TblStyle.GridColumnStyles[4].Width = 60;