Required radAsyncUpload control on page with many other controls

Hello,

 I have 2 radAsyncUpload controls and both of them are required on my content page.  I also have multiple textboxes and a listbox that are also required.

I have tried using the RequiredFieldValidator and it works but not on the radAsyncUpload control.  I search the forum and found the customvalidator to check but that works for the radAsyncUpload control but not the other controls. 

 Is there a way I can check all my controls before I send anything to the server?

I'm using Telerik Tools 2013 Q1 NET 45.  This page is using a master page.

Any help would be greatly appreciated