Wpf combobox not updating when source updates dating phonelines
The other options are Property Changed, Lost Focus and Explicit. For that reason, I have added a button next to the Text Box, which will update the source value on demand.
However, since WPF is pretty good at controlling this for you, the default value should suffice for most cases, where you will get the best mix of a constantly updated UI and good performance.
For those situations where you need more control of the process, this property will definitely help though.