I’m working on a project developing an application for a touch-screen interface.  As such, all of my screen elements are BIG, to accommodate navigation via touch.  It occurred to me that I could save space by eliminating labels for textboxes.  Of course, I don’t really want to have a bunch of textboxes with no way of knowing which textbox is for which bit of data.  I wanted a way to have the textbox display default text when it’s empty, but to allow for otherwise normal input.  I chose to implement both the OnTextChanged and PreviewTextInput methods to accommodate this functionality.

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