I was fooling around with an adorner in a test project and decided to use a TextBox instead of a ComboBox for convenience. Unfortunately, I found I couldn’t type into the TextBox. According to Jim Nakashima, this can be addressed by setting the AdornerPanel.IsContentFocusable property, and he’s right.
I am bothered by the “bug” that sends “Delete” input to the designer instead of the TextBox. I don’t call this a bug, I call it a showstopper. Oh well, I guess I’ll be able to use TextBox controls in my adorners when we are able to drop VS 2008 support in 5 or 6 years.