There's a typeo in the documentation for the RadComboBox.
http://www.telerik.com/help/radcontrols/prometheus/combo_OnClientSelectedIndexChanged.html
In the javascript, there is a call to:
item.get_comboBox.set_text("...");
should be:
item.get_comboBox().set_text("........");
missing the () braces
http://www.telerik.com/help/radcontrols/prometheus/combo_OnClientSelectedIndexChanged.html
In the javascript, there is a call to:
item.get_comboBox.set_text("...");
should be:
item.get_comboBox().set_text("........");
missing the () braces