Specifies whether bars (or wedges) are painted using a linear gradient fill.
property Gradient: Boolean;
If False, bars are filled with Color / ColorEmpty.
If True, bars are filled with a gradient from Color / ColorEmpty (at bottom) to a twice lighter color (at top).
VCL and LCL: Gradient is used only if visualizers are drawn using GDI+ (in Delphi XE2+ and optionally in Lazarus).
Default value
True