property Graph.Sort as String
Defines the list of series to be sorted, separated by spaces

TypeDescription
String A string expression that defines the list of series to be sorted, separated by spaces. Each series can be extended with a ":D" suffix, indicating a descending sorting order for the series.
The Sort property sorts the values of the chart. The Reverse property defines the direction of the category axis.

For instance:

The following screen shot shows the chart using unsorted data (Sort property is ""):

The following screen shot shows the chart using unsorted data (Sort property is "0"):

The following screen shot shows the chart using unsorted data (Sort property is "0:D"):