procedure AddHighValues(High: TVec; Low: double; Offset: double; Step: double);
Use this method to pass values to the HighLow series when the drawing mode is overview.
Result: stored in self (calling object)
Remarks:
The Offset defines the start on the X axis and the Step the distance between consecutive samples on the X axis. The src should contain the data that is to be drawn. For THighLowSeries there should be one high and low value for each x value. The two Y values must be interleaved: ((High[0], Low), (High[1], Low), (High[2], Low),..)