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CoolTrayIcon Doku:
NOTE: From WinXP SP 2 the balloon hint supports a custom icon, which is the tray icon itself (the Icon property). To do this, set IconType to bitCustom. If you want the balloon hint to show a custom icon which is not the same as Icon, you must change Icon before calling ShowBalloonHint, then change Icon back again.
Wirf mal einen Blick in "CoolTrayIcon.chm"; da stehen viele nützliche Tipps drin...
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