I have a modified version of HOL 10 that rehosts the Designer Control but when I attempt to create a Rule Condition I cannot reference any activity properties within the workflow in the Rules Condition Editor. I have no such problem binding activity properties together through <Activity Reference>.
Anyone have any idea why this might be

Rule Conditions using activity properties in hosted Designer Control
wlian
Failing to host the rules editor is a known bug in that sample. We're planning an update for the WF release candidate. Vihang on our team showed me the fix the other day, perhaps he will share it.
Cheers,
Paul