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So far in this tutorial, we have mostly created bindings between UI elements and existing classes, but in real life applications, you will obviously be binding to your own data objects.This is just as easy, but once you start doing it, you might discover something that disappoints you: Changes are not automatically reflected, like they were in previous examples.
Triggers come in multiple flavors: Property triggers, event triggers and data triggers.
The problem is that none of the buttons seems to work. The first step is to get the UI to respond to changes in the list source (Items Source), like when we add or delete a user.
What we need is a list that notifies any destinations of changes to its content, and fortunately, WPF provides a type of list that will do just that.
This is a bit more cumbersome than just changing the list type, like we did above, but it's still one of the simplest way to accomplish these automatic updates.
With the two changes described above, we now have an example that WILL reflect changes in the data source.