Bar chart color expression

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Description: Configure bar chart color expression.
Assumptions: myVis is a visualization type script parameter.

from Spotfire.Dxp.Application.Visuals import VisualContent
myVisVC = myVis.As[VisualContent]()

myDataTable = myVisVC.Data.DataTableReference 
#myDataTable = Document.Data.Tables["MyDataTableName"]

myVisVC.ColorAxis.Expression = "["+str(myDataTable.Columns[2]) +"]"
#myVisVC.ColorAxis.Expression = "[Category]"