TreeGrid recordComponent issue using VIEWPORT pooling mode

[massimo]

Hello!
I'm facing an issue using VIEWPORT pooling mode on a TreeGrid.
I overrode the createRecordComponent method just to return a Label when a certain attribute has a value not null.
The first time I expand all the nodes, everything works fine, as in the following screenshot



while the second time one of the label is drawn on the wrong row, as you can see here



Here you are a code snippet

// UI initialization
final TreeGrid grid = new TreeGrid() {
    @Override
    protected Canvas createRecordComponent(ListGridRecord record, Integer colNum) {

        if (getFieldName(colNum).equals("pie")) {

            Integer pieValue = record.getAttributeAsInt("pie");

            if (pieValue != null) {
                Label label = new Label("pie value is " + pieValue);
                label.setHeight(20);
                return label;
            }
        }
        return null;
    }
};
...
grid.setRecordComponentPoolingMode(RecordComponentPoolingMode.VIEWPORT);

The issue is not reproducible with other pooling modes.
Please note that reducing further the tree structure the problem doesn't arise, and also the position of nodes without label matters.
However I attached a standalone test case with the complete code in [ATTACH]6764[/ATTACH]

Reproduced on Firefox 24 using

SmartGwt version:4.0p
SmartClient Version: v9.0p_2013-12-01/LGPL Development Only (built 2013-12-01)

[massimo]

Hello Isomorphic, any idea about problem I'm facing?

[massimo]

Hello Isomorphic, any idea about problem I'm facing?

[Isomorphic]

We've made a change to address this - please retest with a build dated December 25 or later

[massimo]

Hello! I tested the patched version built 2014-01-05, using submitted class and code currently under development, where we originally found the problem, everything seems work correctly, thank you very much!
Have a nice day!