Is there any way to listen to changes of a DependencyProperty? I want to be notified and perform some actions when the value changes but I cannot use binding. It is a DependencyProperty of another class.
If it's a DependencyProperty of a separate class, the easiest way is to bind a value to it, and listen to changes on that value.
If the DP is one you're implementing in your own class, then you can register a PropertyChangedCallback when you create the DependencyProperty. You can use this to listen to changes of the property.
If you're working with a subclass, you can use OverrideMetadata to add your own PropertyChangedCallback to the DP that will get called instead of any original one.