How to conditionally make on of four TextFields UNEDITABLE

Hi all,
I have this app where I want to select one of four values to be calculated based on the input in three different ones.
So, I have this ChoiceGroup from which I select one item. I then have the itemStateChanged make the corresponding TextField uneditable and all others editable.
This all works like a charm, UNLESS I change a value in one of the editable TextFields and from that event change the value of the uneditable on (through setString()).
If I do that (and without that the whole application isn't really worth the while), I get an NPE:
java.lang.NullPointerException
at com.sun.midp.lcdui.DefaultInputMethodHandler.setConstraints(Unknown Source)
at javax.microedition.lcdui.TextField$InputMethodClientImpl.setConstraints(Unknown Source)
at javax.microedition.lcdui.TextField.setConstraints(Unknown Source)
at dofCalc.unselectTextFields(dofCalc.java:305)
at dofCalc.resetTextFields(dofCalc.java:325)
at dofCalc.itemStateChanged(dofCalc.java:430)
at javax.microedition.lcdui.Form.callItemStateChanged(Unknown Source)
at javax.microedition.lcdui.Display.callItemStateChanged(Unknown Source)
at javax.microedition.lcdui.Display.access$1000(Unknown Source)
at javax.microedition.lcdui.Display$DisplayAccessor.callItemStateChanged(Unknown Source)
at javax.microedition.lcdui.Display$DisplayManagerImpl.callItemStateChanged(Unknown Source)
at com.sun.midp.lcdui.DefaultEventHandler.itemStateChangedEvent(Unknown Source)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(Unknown Source)
at java.lang.Thread.run(Thread.java:613)
What's going on here?
Is there no other way short of recreating the complete set of TextFields after every change of the choiceGroup?
TIA,
Karl.

It's a known but neglected bug. From my posts on these forums
[http://forums.sun.com/thread.jspa?threadID=698935] - #5
[http://forums.sun.com/thread.jspa?threadID=5240582] - #1
[http://forums.sun.com/thread.jspa?threadID=5214941] - #3
[http://forums.sun.com/thread.jspa?threadID=5274552] - #2
A possible workaround is to design 4 separate forms, each with one of the four TextFields disabled and setCurrent(...) on selection from the ChoiceGroup. Or you may be able to swap the TextFields on a single form using Form#delete(itemNum) and insertitemNum, item).
db

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