[solved] $form->setFieldAttribute readonly won't work? - Joomla! Forum - community, help and support

hi,
i have tried set temporary form field 'readonly'.
so have added in getform() method:

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$form->setfieldattribute( 'fieldname', 'readonly', 'readonly' );

but seems not work. can seen in debugger, readonly option added in xml field attributes. not more in generated html output.

when try this, works:

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$form->setfieldattribute( 'fieldname', 'disabled', 'true' );

but need readonly!
exists here bug?

edit:
sorry. must be:

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$form->setfieldattribute( 'fieldname', 'readonly', 'true' );