builder.add(buttonAddSupplier, cc.xy(6, 10));
builder.addLabel("Fakturanr:", cc.xy(2, 12));
builder.add(textFieldInvoiceNr, cc.xy(4, 12));
builder.add(ButtonBarFactory.buildCenteredBar(buttonOk, buttonCancel),
cc.xyw(2, 14, 4));
return new IconFeedbackPanel(validationResultModel, builder.getPanel());
}