How to Add an Image in group when group is collapse?

GoJS
1

I want to add an icon when we collapse a group elements. Below the Group name.
How to Add an Image in group when group is collapse?
Can anyone help me?

2

Add a Picture in your Group template and have it include a Binding:

new go.Binding("visible", "isSubGraphExpanded").ofObject()
3

I need to show it when Group.isSubGraphExpanded is false.

4

Use a converter:
function(x) { return !x; }

5

Thanks a lot.