How to Enable/Disable MessageTextInput Read Only property in PFR?

Dear All,
When i click on a submit button i need to enable/disable the Read only property of MessageTextInput item.
Can any one tell me how to do this?
I am executing the code
if (pageContext.getParameter("EnableBT") != null) {
OAMessageTextInputBean beanEmployeeIdCL = (OAMessageTextInputBean)webBean.findIndexedChildRecursive("EmployeeIdCL");
beanEmployeeIdCL.setReadOnly(false);
When i used the above code in Process Form Request method it is showing developer mode exception in run time as we can call the above code only in Process Request form.
Request to please help regarding this.
Thanks & Regards,
CAK

CAK,
You need to make use of Partial Page Rendering (PPR) & SPELL. Modifying the bean property in PFR is not supported in OAF.
Refer - PPR section of Devguide for more.
Regards
Gyan

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