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As of Q1 SP2, the RadComboBox exposes a new client-side event - OnClientDropDownClosed.

The OnClientDropDownClosed client-side event occurs after the drop-down list has been closed.

The event handler receives two parameters:

  1. The instance of the combobox firing the event.

  2. An eventArgs parameter containing the following method:

  • get_domEvent() returns the DOM event object of the drop-down closed.

You can use this event to perform any client-side actions when the drop-down is completely closed:

<script type="text/javascript">
    function OnClientDropDownClosedHandler(sender, eventArgs) {
        alert("Dropdown is closed now");


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