To change a property, you use:
property <#object#;property=value[;property
N=value
N]>
I'm not sure exactly how it's like in QDK.
There should be a little property changing demo in my quest demo archive:
http://www.compwhizz.freeserve.co.uk/asldemos/There's a function and property demo. (func&prop.asl)
May help you out..
I remember doing another painting test, on a sign, must have missed uploading it.
If I have a search round I may be able to find it - or make another in line with my newer demo's.