Occurs when the BufferingProgress property changes.
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
Buffering will pause for VC-1 content if the stream is paused.
The event typically occurs multiple times during a download. The event will occur when the BufferingProgress value increases by 0.05 or more, compared to the last time the event was raised, and also when the value reaches 1.0.