Provides handling for the MouseLeftButtonDown event.
Assembly: System.Windows (in System.Windows.dll)
This implementation marks the event as handled by setting the Handled property of the event data to true.
The method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.Notes to Inheritors
When overriding in a derived class, make sure to call the base class’s method so that registered delegates receive the event.