FillStyle Tab (ChartStyles)
The Pattern dropdown allows you to change the fill pattern for various chart types.
Chart2D.ChartGroups.Item(ii).Styles.Item(ii).Fill.Pattern
Color Area
The RGB textbox lists the RGB value of the pattern for the specific chart area. The ellipsis button next to the textbox opens the customized color pallet.
The Name textbox lists the current color that is being used by the pattern.
Chart2D.ChartGroups.Item(ii).Styles.Item(ii).Fill.Interior.ForegroundColor