You can manage and update the colors you use in Vizlib Combo Chart by using the Colors settings in the Appearance panel.
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You can choose between a pre-defined collection of colors, or customizing your own color palette with a comma-separated collection of hex color codes (Figure 1). The default color setting is Auto, which inherits colors from master items (master measures and master dimensions), with plans to implement support for master item colors for dimension values.
When you enable the Custom setting in Colors, you'll see the option to Use Custom Colors, where you can enter you own color palette. If you select Use Color Scheme, you can choose from the 3 pre-defined options - Single Color (all chart items are the same color), Multicolored (the chart is colored to a defined color scheme), or color By measure (colors are set by the measures selected).
Figure 1: Colors
You can also choose to reverse the order of the colors in your palette by choosing Reverse Colors, and have a value keep its color after it's selected by enabling Persistent Colors. There is also a customization option for Null Value Colors.
Figure 2 shows a Vizlib Combo Chart changing color as different settings are selected.
Figure 2: Colors Example