public string OnClientSelectedIndexChanged { get; set; }

Public Property OnClientSelectedIndexChanged As String
	Get
	Set

public:
property String^ OnClientSelectedIndexChanged {
	String^ get ();
	void set (String^ value);
}

member OnClientSelectedIndexChanged : string with get, set

<script language="javascript">               
    function onSelectedIndexChanged(sender,eventArgs)
    {        
            var item = eventArgs.get_item();
            // alert the new item text and value.
            alert(item.get_text() + ":" + item.get_value());
    }                        
</script>

<kettic:kaxcombobox ID="KaxComboBox1" runat="server" 
      OnClientSelectedIndexChanged="onSelectedIndexChanged">
</kettic:kaxcombobox>