If you are updating the select statement in the RadComboBoxPlan_OnItemsRequested
event handler you have to make sure the OnItemsRequested
event is fired at the right time when you need it. This event fires when the user starts typing text in the input field, while clicking on the RadComboBoxItems would fire the OnSelectedIndexChanged
Placing break points in the event handlers to track when each of them is fired, would help you plan which user action should cause the select statement to be updated and the corresponding event handler the code should be executed in.
You can find a list of the RadComboBox server-side events in our Server Side Events
documentation article, and the corresponding articles provide more details on the conditions under which the events are fired.
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