Select All by Group Easy Chary

What is the property (if any) I can use to toggle select all (show) pens by group or total?

I made some checkboxes for each group, and bound selected property to another checkbox labeled ALL.

this code in each property change of the group checkboxes

dsPens = event.source.parent.getComponent(‘Easy Chart’).pens

column 6 is the enabled column

for num in range(start,start+groupSize):
dsPens = system.dataset.setValue(dsPens, num, 7, checkValue)
event.source.parent.getComponent(‘Easy Chart’).pens=dsPens[/code]

It takes up a lot of room on my screen though, so I wish I could do this within the group display but this works well too.