Install:
PM> Install-Package AutoCompleteTextBox -Version 1.7.3
WPF AutoComplete TextBox is an original work from Bhardwaj Deepak
This control originally features:
- Load suggestions on-demand
 - Supports MVVM
 - Asynchronously load suggestions
 - Watermark
 - Icon
 - DataTemplate for suggestions
 - DataTemplateSelector for suggestions
 
- More properties for making things easier:
 - Also, fixed up the focus control.
 - Removed VB.NET stuff from original solution.
 - Added a new demo showcasing the new capabilities
 - Added a custom style in the new demo, turning on validation messages
 - Added property MaxPopupHeight. Setting this property, will limit the popup height to the size you wish.
 - Much more from collaborators!
 
- IsReadOnly property fix. (thanks @chefarbeiter)
 
A WPF application using the Material Design in XAML Toolkit and MVVM. See it in action!
PS.: Screen cast by: http://recordit.co/

