open window when click in NumericTextBox

[Mona]

hello

i'm using NumericTextBox and want to open window to enter password when trying to write in NumericTextBox, just when click on it before begin to write anything and when close this popup (depend on the result), back to focus again or remove focus, so i think i need to be focus when open pop up window
i tried to use onfocus but it didn't work well, it displayed my pop up many time till remove my focus

Can you help me which event can help me and 

[Princy]

Hello,

Try the following javascript to open a window OnFocus.
JS:

<script type="text/javascript">
 function OnFocus(sender, args)
   {
     var wd = window.radopen(null, "RadWindow1");
   }
</script>

Thanks,
Princy.