Hi,

 

Because the Flash/Silverlight limited ,

 

So Uploader only support this logic :

 

1 - user click the button (actually click on the Flash/Siverlight transparent layer, not on the button)

 

2 - uploader fire the CuteWebUI_AjaxUploader_OnBrowse event.

  you can put your login in that function , decide show the dialog or cancel it.

 

There's no other way to do more.  Setteing the onclick event on the button also have no effect.

 

Regards,
Terry