icon used in tray area

Tue Jun 18 18:42:12 BST 2013

I have a perl-Tk tool that lives in my System Tray. In KDE 4.10 the tray 
icon is the generic X application icon, whereas in 4.6 it was the tool's 
icon. What determines the icon used in the tray? What do I need to adjust 
so the tray uses the tool's icon?
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