A ColorBand (ChartTool) assigned to Bottom axis on a TChart Component will be compressed when beeing dragged beyond start or end of Bottom axis. ColorBand.StartValue and ColorBand.Endvalue will both take either Start- or Endvalue of Bottom Axis.
Earlier versions of Chart used to preserve the Start- And EndValues of Colorbands, even if the Bands were not visible within the current Bottom axis area.