I was wondering why setReadOnly(false) did not work on my TextArea
With this implementation in ValueBaseField its surely not working:
Code:
  public void setReadOnly(boolean readOnly) {
    getCell().setReadOnly(true);
    getCell().getInputElement(getElement()).setReadOnly(readOnly);
  }
workaround:
I call textarea.getCell().setReadOnly(false) directly after calling textarea.setReadOnly(false).

I used gxt-3.0.3-SNAPSHOT