ChartGroup Object (Excel)
Represents one or more series plotted in a chart with the same format.
Remarks
A chart contains one or more chart groups, each chart group contains one or more Series objects, and each series contains one or more Points objects. For example, a single chart might contain both a line chart group, containing all the series plotted with the line chart format, and a bar chart group, containing all the series plotted with the bar chart format. The ChartGroup object is a member of the ChartGroups collection.
Use ChartGroups(index), where index is the chart-group index number, to return a single ChartGroup object.
Because the index number for a particular chart group can change if the chart format used for that group is changed, it may be easier to use one of the named chart group shortcut methods to return a particular chart group. The PieGroups method returns the collection of pie chart groups in a chart, the LineGroups method returns the collection of line chart groups, and so on. Each of these methods can be used with an index number to return a single ChartGroup object, or without an index number to return a ChartGroups collection.
Example
The following example adds drop lines to chart group 1 on chart sheet 1.
Charts(1).ChartGroups(1).HasDropLines = True
If the chart has been activated, you can use the ActiveChart property.
Charts(1).Activate
ActiveChart.ChartGroups(1).HasDropLines = True