In Xaml TextBox with a Watermark that Disappears after First Iinput

Question

In a TextBox provide a description that vanishes after the first input. This should provide a little help to the user what he should enter in the text field such as Watermar

Answer 1

Here's a XAML only solution, using rather basic "mechanisms".

I'm in no way an expert on XAML. There are probably better and/or more elegant ways to do that, but this is what I got by trying and combining stuff I found on this site.

I thought it is quite straight forward, explicit and this can be useful to some ...

Feel free to comment on any issues or things that can be done better.