Hi Infragistics,

I am currently doing validation on ComboBox elements by binding it to a property in the ViewModel and then doing an UpdateSource() call. This works perfectly fine.

However, I was not able to do the equivalent for the XamComboEditor. I can send you more code if necessary.

Any suggestions? The XamComboEditor loads up a list of user names from a SQL datasource as a collection of <T> objects.

This is what the UI looks like currently. The comboBox lights up when I try to submit without putting in anything.

I am using code like this in the code behind. how do I do the equivalent for a XamComboEditor?

cboReccomendedAmount. GetBindingExpression (ComboBox.SelectedValueProperty) . UpdateSource();

and my properties 

public string SelectedRecAmount
{
       get
       {
              return _selectedRecAmount;
       }
       set
       {
              if (string.IsNullOrEmpty(value))
              {
              throw new Exception("Please Select a Recommended Amount");
               }
               _selectedRecAmount = value;
               OnNotifyPropertyChanged("SelectedRecAmount");
        }
}

thanks much,

-Steven