February 14, 2014
Called before the MouseEnter event occurs.
Assembly: System.Windows (in System.Windows.dll)
The method is called before any event handler for the MouseEnter event is called. This method allows derived classes to handle the MouseEnter event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Because Windows Phone only provides a touchscreen surface for pointer interactions, the MouseEnter event will not fire unless your control is tapped onscreen. Therefore and OnMouseLeftButtonDown are functionally redundant.