import win32com.client

from win32com.client import constants as C

propName = "TheProperty"

gridDataName = "TheGrid"

siProperty = Application.ActiveSceneRoot.AddProperty( "CustomProperty", False, propName ) 

gridData = siProperty.AddGridParameter(gridDataName).Value 

gridData.ColumnCount = 3

gridData.RowCount = 3

for row in range( 3 ):

	gridData.SetRowLabel( row, "Row %d"%row )

	for col in range ( 3 ):

		if row == 1:

			gridData.SetColumnLabel( col, "Col %d"%col )

		gridData.SetCell( col, row, "%d,%d"%( col, row ) )

# Set the diagonal as read-only

ROcells = [ 0,0, 1,1, 2,2 ]

gridData.SetCellReadOnlyFlags( ROcells, True ) 

Application.InspectObj( siProperty )