I got followin recommendation (Thx Mark) on how go about doing what we need:
"Instead of using the toggle controls you can use icon(s) and an invokeScriptControl
The Configuration for the Invoke Script Control would be:
Event: onClick
Action: toggle
For:
Then to swap out the to images (plus.gif and minus.gif) you can either use two different image controls (and child scripts) and have one each hidden while the other is active using more scripts, OR, write a script to swap back and forth between the two images with one Icon control."
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