I created below text box with the help of WPF Adorner and Reactive Extension, I wanted to create a text box that gives hint as you type analogous to bloomberg-terminal/search-boxes. Used Rx to throttle user input and show the hint 500ms after user stops typing.
For the text hints, I did not use any grammar parser rather mocked based on word count
Full source is available here http://codetidy.com/1674/
