Well, I give it a try. Extracted the relevant code:

I define the listview thus (this.listItems is an empty array):

  this.listView   = new my.app.listview.ListView(this.listItems,
this.listHeader);
  this.listView.set({ width:"100%", height:"75%" });
  this.contentBlock.add(this.listView);

contentBlock is a VerticalBoxLayout:

  this.contentBlock = new qx.ui.layout.VerticalBoxLayout();
  this.contentBlock.set({height: qx.constant.Core.FLEX, spacing: 8,
paddingLeft: 8, paddingRight: 8, paddingTop: 8, paddingBottom: 8});
  this.coreLayout.add(this.contentBlock);

coreLayout also is a VerticalBoxLayout:

  this.coreLayout = new qx.ui.layout.VerticalBoxLayout();
  this.coreLayout.set({ height : qx.constant.Core.HUNDREDPERCENT, width
: qx.constant.Core.HUNDREDPERCENT });
  this.add(this.coreLayout);

"this" is a window:

  qx.ui.window.Window.call(this);
  this.set({
    top : 200, left : 220,
    moveMethod : 'opaque', moveable : true,
    modal : true, resizeable : false,
    showMaximize : false, showMinimize : false, showClose : true,
    allowClose : true
  });

I know, it's quite nested, but I can't change it. So, what exactly is
the problem ? :-)

Matthias

> This is an error message, which should inform you about some 
> misconfiguration of your widgets. Maybe some type of cascaded 
> visible/invisible nodes. Can you reduce this problem to a 
> small piece of code and submit it to the list?
> 
> Sebastian
> 
> Matthias Reuter schrieb:
>> On startup of our application, qooxdoo complains about
>> 
>> "our.app.ListViewPane: Want to render an invisible child: [object 
>> qx.ui.listview.ListViewContentCellText] -> omitting!"
>> 
>> This does not seem to reduce functionality, so I might keep 
>> ignoring it. Nonetheless I am interested in what exactly qooxdoo
>> is trying to tell me. My guess is that it is caused by an empty
>> array for list view data.
>> 
>> Any idea? 

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