Changing Validation Icons on the fly?

Hi,

My program contains half a dozen TextFields, which are programatically
updated depending on which row is selected in a table. Each has three
possible states - error, warning or ok.

However, I cannot get the validation icons to update. Here is some
test code I've been using, which simply switches based on an
incremental counter value:
if (i%2 == 0) {
textField.getImages().setInvalid(errorImagePrototype);
textField.markInvalid("Mandatory Field required");
} else {
textField.getImages().setInvalid(warningImagePrototype);
textField.markInvalid("Optional Field not required");
}

However, although the message gets updated, the image doesn't.

Does anyone know how to force the icons to update? I have tried
repainting on the TextField and the containing panel.

Alternatively - should I be approaching this differently?

Many thanks!

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