Hi,
the "qx.ui.tree.VirtualTreeItem" which you are using right now has (i.e.
knows) no 'size' property. Therefore this line fails in your code example:
---
...
controller.bindProperty("size", "size", null, item, id);
...
---
You are missing a custom class
("demobrowser.demo.virtual.tree.TreeItem") which extends
"qx.ui.tree.VirtualTreeItem" and was written particularly for the "Tree
Columns"-demo.
See:
https://github.com/qooxdoo/qooxdoo/blob/master/application/demobrowser/source/class/demobrowser/demo/virtual/tree/TreeItem.js
If you copy this class and use it as return value of createItem()
similar to the official "Tree Columns"-demo it should work:
---
...
// delegate implementation
createItem : function() {
return new demobrowser.demo.virtual.tree.TreeItem();
}
...
---
Regards
Richard
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