Hello Silvina P.,
By default the ComboBox column will work only with values present in the ItemsSource.
I guess for your scenario, you need when a new value is typed , this value to be added to the itemssource.
This is not an automatic featureof the combobox column . You can implement it in a few lines of code the following way :
1. Subscribe to the CellEditEnded event of RadGridView
2. Within the event handler write your own logic to add thew newly typed item to the collection.
Spomething like :
sender, GridViewCellEditEndedEventArgs e)
//here you may need to perform a check which column is being edited to be sure it is the one with the combobox
// this may be done by checking the e.Cell.Column
newlyTypedText = ((RadComboBox)e.EditingElement).Text;
//here add the newlyTypedText item to the ComboBoxColumn.ItemsSource collection
Let me know if you find troubles implementig this approach into your project.
the Telerik team