I show a list of values to the user. If the user types a value that's not in the list, it must be added to the list.
I try to do this in OnClientBlur with the following code. I start with insert at index = 0 as first step.
Next step is to add at the end of the list, but the code fails in the first step. I have attached a screendump of the error.
var items = sender.get_items();
alert('items.get_count():' + items.get_count());
var comboItem = new Telerik.Web.UI.RadComboBoxItem();