How can I show a Balloon Tip over a textbox?

Question

I have a C# WPF application using XAML and MVVM. My question is: How can I show a balloon tooltip above a text box for some invalid data entered by the user?

I want

Answer 1

I've been searching for a better solution than the BalloonDecorator, and ran across the http://www.hardcodet.net/projects/wpf-notifyicon project. It is using the WinAPI at the lowest level, which might give you a head start on building your own solution. It appears that at first glance it could potentially solve it, but I haven't had enough time to verify that the BalloonTip can be made to behave as you've described.

Good luck on your project!