EF4 + DataAnnotations: Insert Error

[Cody]

[I noticed that my company has support tickets so I will resubmit as a support ticket]

I took the sample from the below post download named 262302_RadDataFormRadGridViewRIAExample and took out the code from the EditEnding event handler. 

I am using internal build version 2011.1.405.1040.

http://www.telerik.com/community/forums/silverlight/data-form/editing-child-entities-on-many-to-many-relationship.aspx#0

I added required data annotation attributes to the .metadata.cs file for the DomainService, ran and now when I click the 'Insert' button on the dataform, enter data that will not pass validation, click 'OK', I get a "System.Exception: Submit error is not handled!".  How do I track down what object to add a handler to??? 

My gut says something about the validation and the Entity Insert could be the problem, but I don't know how to track down further.

[Required()]
public string FirstName { get; set; }

public Nullable<DateTime> HireDate { get; set; }

public string HomePhone { get; set; }

[Required()]
public string LastName { get; set; }

(I am really liking the telerik support and enjoying the DataForm)

Thanks,

Cody

[Pavel Pavlov]

Hello Cody,

To avoid duplication , I am going to post further answers in your support ticket. Can you please meanwhile attach me your project to the support ticket . Once I am able to reproduce the problem here, I am sure we can think of some solution  or a workarround.

Greetings,
Pavel Pavlov
the Telerik team