How to Invoke a Command on the ViewModel by Pressing the Enter Key in a TextBox with Silverlight and MVVM

I recently attempted to upgrade a WPF application to compile for Silverlight as well. One of the many issues I ran into was that in the WPF version, pressing the Enter key while I was in a TextBox caused the OK button I had on the form to be clicked by virtue of the fact that I could set the IsDefault property on the button. However, after porting to Silverlight, that no longer worked, since the IsDefault property is missing..

A web-search revealed that someone had made a "behavior" that allows a specified button to be clicked when you press Enter within a TextBox. However, it had one big problem: at the point that the command fired in my ViewModel, the value bound to the textbox contents had not been updated, since the textbox had not lost focus.

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