This spot specifies the initial point in the diagram's DiagramBounds at which the InitialPanelSpot of the Panel should be located. The default values of this property and of InitialPanelSpot cause the top-left corner of the diagram contents to be positioned at the top-left corner of the panel.
This property only has an effect on the initial diagram shown if the InitialStretch property has its default value of StretchPolicy.Unstretched, and if the InitialPosition property has its default value of a Point whose X or Y values are Double.NaN, and if both spots are specific spots (i.e. Spot.IsSpot are true).