Hello,

 I'm not sure if you have gotten it working yet but here is the solution to make it look like a dropdownlist

public void InstantiateIn(System.Web.UI.Control container)
 {
 Infragistics.WebUI.UltraWebGrid.CellItem cellitem1 = ((Infragistics.WebUI.UltraWebGrid.CellItem)(container));
 WebCombo combo = new WebCombo();
 cellitem1.Controls.Add(combo);
 //Set data source

 //Set the webcombo to be editable

combo.Editable = true;
 combo.Width = Unit.Pixel(100);
 combo.DropDownLayout.DropdownWidth = Unit.Pixel(104);
 combo.DropDownLayout.DropdownHeight = Unit.Pixel(70);
 combo.DropDownLayout.ColHeadersVisible = Infragistics.WebUI.UltraWebGrid.ShowMarginInfo.No;
 combo.DropDownLayout.RowSelectors = Infragistics.WebUI.UltraWebGrid.RowSelectors.No;
 }

All you need to do is use these 5 lines of code

 combo.Width = Unit.Pixel(100);
 combo.DropDownLayout.DropdownWidth = Unit.Pixel(104);
 combo.DropDownLayout.DropdownHeight = Unit.Pixel(70);
 combo.DropDownLayout.ColHeadersVisible = Infragistics.WebUI.UltraWebGrid.ShowMarginInfo.No;
 combo.DropDownLayout.RowSelectors = Infragistics.WebUI.UltraWebGrid.RowSelectors.No;

To set the combo to be editable:

combo.Editable = true;

Hope that helps,

HS2