Custom properties can only be set on a control in OPM. You can not dynamically set them at runtime. What you can do is push additional parameters into the velocity context via the OnApplyTemplatesEvent.
Edited by: Kristy Van Der Vlist on 13-Jun-2012 18:03
Most of the things are not given in developer help and even here I am not getting people that could help me with such things. Oracle should add some core OPA developers to this forum that can help with coding such things.