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One way would be to run a timer and fetch the image again in the timer event handler.
Change picture by same name on server
I click Button, click again, again, again but picture no change
If I use timer event handler, Is same I click Button click click click?
Hmmm... You might be able to set up data binding to handle this. I'm not sure exactly how you would do this, but somehow you need to have the server broadcast something to any apps using the picture, as the apps will have no way of knowing picture changed. FMS?
You may have to disable caching to get the image load again. Do a google search on how to do it.