Calculate.override bugs; LC ES 2; Acrobat 9.4/Reader 9.4

Hi All
I have encountered possible bugs in calculate.override.
It seems that I cannot turn it off and allow the user to type freely, and then turn it on again.
The situation simplifed:
1) There are 3 text boxes, A, B and C.
2) A and B are normal text boxes, free to type.
3) C is set as 'Calculated - Read Only', the calculation is A.rawValue + B.rawValue
Now I want to allow the user to type anything they want into C (by pressing a button), so I have to disable the calculation (and the read only attribute, set this to open).
I also want to restore the calculation if I wish (by pressing a button).
I discovered several issues here:
==========
Disable Calc
==========
1) C.calculate.override = "disabled"; // disable calc
    Having only this line does nothing, the calculation still occurs, nothing has changed.
    Note that C is still read only and the user cannot type into the box, but for now I am just pointing out that the calculation should have stopped.
2) C.calculate.override = "disabled"; // disable calc
C.access = "open"; // allow user to type
    This seems to work somewhat, however the calculation is STILL performed UNTIL the user actually types something into C.
    So I tried adding this line to change the value of C, thereby preventing having the user to type into C:
    C.rawValue = 0;
    This doesn't work, the rawValue of C does not change, the calculation is STILL performed UNTIL the user actually types something into C.
3) Tried messing around with the code to no avail:
    C.access = "open"; // allow user to type
C.rawValue = 0;
C.calculate.override = "disabled"; // disable calc
* It seems that C.calculate.override only does something when C.access is used. *
==========
Enable Calc
==========
4) C.calculate.override = "error"; // restore calc
     Does nothing.
5) C.access = "readOnly"; // user cannot type
C.calculate.override = "error"; // restore calc
     Again does nothing.
6) C.calculate.override = "error"; // restore calc
   C.access = "readOnly"; // user cannot type
     Nothing again.
I have tried just about everything, mixing up code, trying "warning" instead of error and so on.
* I can't seem to restore calculation after disabling it *
Am I missing something here?
I can't seem to attach files, I could mail the PDF so you guys can mess around with it.
LC ES 2; Acrobat 9.4/Reader 9.4
Many thanks
Regards
Shivan

I did the same as you.
// Open the field to allow user entries
NumericField1.access = "open";
// Allow override, means you will not get an error message when the calculated value is changed
NumericField1.calculate.override = "disabled";
NumericField1.value.float.value = "0";
Restore original state of the field.
NumericField1.access = "readOnly"
NumericField1.calculate.override = "error"
NumericField1.rawValue = null
NumericField1.execCalculate()
But you're right, the restore does not work.
I tested execEvent("calculate") and execCalculate() with no avail.
Very odd!

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