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

For anyone who might be interested in this question, check material design (http://materialdesigninxaml.net/).

With this library, it is really easy :