Something odd¹s happened in your code, I think maybe you¹re setting the
appearance on something other than the ListItem.  Here¹s my test app:
/**

 * @asset(xyz/*)

 */

qx.Class.define("xyz.Application", {

  extend: qx.application.Standalone,

  members: {

    main: function() {

      this.base(arguments);

      if (qx.core.Environment.get("qx.debug")) {

        qx.log.appender.Native;

        qx.log.appender.Console;

      }



      var doc = this.getRoot();

      var lst = new qx.ui.form.List().set({

        minWidth: 300,

        minHeight: 400

      });



      lst.add(new qx.ui.form.ListItem("Alpha", "xyz/test.png").set({

        appearance: "custom-listitem"

      }));

      lst.add(new qx.ui.form.ListItem("Bravo", "xyz/test.png").set({

        appearance: "custom-listitem"

      }));

      lst.add(new qx.ui.form.ListItem("Charlie", "xyz/test.png").set({

        appearance: "custom-listitem"

      }));

      lst.add(new qx.ui.form.ListItem("Delta", "xyz/test.png").set({

        appearance: "custom-listitem"

      }));

      lst.add(new qx.ui.form.ListItem("Echo", "xyz/test.png").set({

        appearance: "custom-listitem"

      }));



      // Add button to document at fixed coordinates

      doc.add(lst, {

        left: 100,

        top: 50

      });

    }

  }

});


qx.Theme.define("xyz.theme.Appearance", {

  extend: qx.theme.modern.Appearance,



  appearances: {

    "custom-listitem": {

      style: function(states) {

        return {

          margin: [ 20, 10 ],

          gap : 20

        };

      }

    }

  }

});





From:  Phyo Arkar <phyo.arkarl...@gmail.com>
Reply-To:  qooxdoo Development <qooxdoo-devel@lists.sourceforge.net>
Date:  Tuesday, 18 August 2015 08:32
To:  qooxdoo Development <qooxdoo-devel@lists.sourceforge.net>
Subject:  Re: [qooxdoo-devel] Set margin between listitems


On Tue, Aug 18, 2015 at 1:57 PM, John Spackman <john-li...@zenesis.com>
wrote:
> typeof hf

Thanks , i am working on it.
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