I am using a RadGrid with Edit Mode = Popup and a user control edit form. The edit form contains a RadNumericTextBox. On postback, the value of the RadNumericTextBox is empty. Why?? If I replace it with a normal <asp:TextBox> then everything works fine, but the RadNumericTextBox doesn't seem to realize that I entered anything in it. Text and Value properties are both empty. Is this a known issue and if so, what's the workaround?