RoundRectRadius is independent from theme resource. RoundRectRadius is applied to the geometry which is filled by color/blur. Theme resource specifies texture which rendered over the filled geometry.
Hmmm, strange then... Restarting DWM proccess had no effect. Maybe I should've restarted the entire system.
UPD.: Yep, it worked.
Edited by EvilAlex, 13 September 2013 - 08:00 AM.