I am trying to find a workaround for incorrect grouping of windows in Docky, and I believe the problem lies with the WMClass attribute that is set for each window. However, I do not know how to view this attribute for open windows. Is there any way to do this?

2 Answers 2


In a terminal, run

 xprop WM_CLASS

and then click the window in question.

  • WM_CLASS: not found.
    – phil294
    May 26, 2017 at 3:02
  • 6
    @Blauhirn run xprop without arguments, you'll get all the properties (and should find WM_CLASS in there, if it's defined)
    – draeath
    May 26, 2017 at 13:30
  • WHen i run this command the cursor only works when i click on the desktop. But when i click on the windows it doesn't work.
    – Maxrunner
    Mar 14, 2018 at 11:51

it's an old problem, look here: bug reported

  • I do not get it Oct 10, 2018 at 20:26
  • @Pierre I pasted by mistake something else, I edited my answer
    – maoamid
    Oct 10, 2018 at 20:30

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