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Thank you for your fast reply.
The controls are hidden by rules. There are multiple rules controlling the display of about 10 attachement controls.
But I have discovered what happened. My fault and a stupid one.
Was including a few css class driven test alerts to see what value was returned and by coincedence I selected all non-hidden controls. So first I was wondering why it returned all display:= block and visibility:= visible because I was so sure to have a mixed state of controls included what apperently ws not the case.
I used now to test:
I used the following script (part):