New Post: Can't seem to attach a handler to a TextBox's PropertyChanged event (WPF)

One can set UpdateSourceTrigger=PropertyChanged or LostFocus, but whereas there is a LostFocus event it doesn't appear that there is a PropertyChanged event that's raised by the TextBox. So it is not a Caliburn.Micro problem. I will try other options. [Lapse of time here....] Attaching to KeyUp works fabulously. "Never mind."