Adding combo box items results in blank lines

I am attempting to add items to a combo box, but when I dothey
become blank lines. If I debug and look at the value being used it
appears to be correct.
Code is as follows:
if (ItemsTypeCombo !=null)
{
// Get list of Items from DB.
DataClass dc = new
DataClass(); dc.TableName = "Items";
dc.ReturnAll();
short row = 0;
foreach (DataRow drItem in dc.TableData.Rows)
{
string ItemName = drItem["Name"].ToString();
ItemTypeCombo.InsertItem(row , ItemName);
row++ ;
}
ItemTypeCombo.Height = 50;
}
When debugging when I look at the ItemName string before it isused to add an item to the combo box it is correct. The items areletters only, no special characters of any kind.SolidworksApi macros