public string OnClientDropDownClosing { get; set; }

Public Property OnClientDropDownClosing As String
	Get
	Set

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

member OnClientDropDownClosing : string with get, set

<script language="javascript">                

function HandleClose(sender, args) 
{ 
    if (someCondition) 
    { 
        args.set_cancel(true);    
    } 
    else 
    { 
        alert("Closing combobox with " + sender.get_items().get_count() + " items"); 
    } 
} 

</script> 


<kettic:kaxcombobox  
      id="KaxComboBox1"  
      Runat="server"  
      OnClientDropDownClosing="HandleClose"> 
</kettic:kaxcombobox>