Wm class of app not found

there r apps need to wm class of other apps to work, i found i can get any wm class for app by that command:
xprop WM_CLASS then click on the window of the app
i tried it with a lot of apps and worked good, but for xfdashboard it gives me not found(i need it's wm class value for zentile)
can i set wm class to an app, or what is the approach for that?

The WM_CLASS should be "xfdashboard"

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