How to set open app icon to be the same as in App Launcher in KDE

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http://unix.stackexchange.com – I am using Fedora 16 with KDE and, for the most part, the icon associated with an app is the same in the open app bar in the bottom of the screen as it is in the Application Launcher in the lower left corner. However, the Thunar file browser has a very generic looking icon in the open app bar, very similar to gedit, which causes me confusion. How do I change the icon that appears for an app in the bottom bar when the app is open? (HowTos)