The overlay can only be set in the LableArea class constructor. The Overlay property is read-only. The default value is false.
When the Overlay property is true, the height of the plot area is adjusted when the TextDirection or TextRotationAngle property in the LabelArea class is changed.
When the Overlay property in the LableArea class is false, the height of the PlotArea is not adjusted. If there is not enough space for the chart title, the title is painted over the plot area.