Gets or sets the horizontal alignment of the video from the VideoBrush.
<object AlignmentX="AlignmentX" .../>
value = object.AlignmentX
object.AlignmentX = value
A value of the enumeration that specifies the horizontal position of the video when applied to the brush.
This property is read/write. The default value is Center.
In addition to AlignmentX and AlignmentY, the Stretch property also affects the portion of the source that will apply to the target region.