>Does the class with 'awd_amount' implement INotifyPropertyChanged ? If so you could handle the event and update the TextBox from there.

I have no idea :(

How do I check and what do I do if it does?

update:

I just found this in the help file:

Starting in MM .NET 3.5, the mmBusinessEntity class implements the INotifyPropertyChanged interface. Entity objects generated by the Business Layer Generator make use of this new interface by calling the OnPropertyChanged() method in the Set() of all entity properties. This ensures that if you manually store a value to an entity object, any user interface element bound to it is automatically updated.

So it looks like it does.

Now to work out how to use it....