The objects which returns by KmlReader.Read method are map shapes objects like to MapPlygon, MapPolyline etc. The MouseEnter event of map shapes is not the same as MouseEnter of the FrameworkElement class.
You should cast the framework element to the MapShape type before attaching a handler.
The sample code is below.
List<FrameworkElement> list = KmlReader.Read(stream);
MapShape shape = element
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