Declaration: ChartBook.Charts[].Height: integer;
Specifies the height of the chart window in pixels. The minimum height is automatically restricted to a value which provides at least a small strip of the graphics area. The minimum height depends on the properties MarginBottom and MarginTop.

Please note that depending on the Align property the Height property might have no effect (i.e. if Align is set to alLeft, alRight or alClient).