In this post you can find this bug http://forum.openlaszlo.org/showthread.php?t=13954
the problem is that method like seek or setVolume are declared as private in as3 compiled view than you can't override them from openlaszlo that declare them public by default e find this problem with Raju Bitter please fix this here is my complete app http://launchpad.net/olwebsuite and there is the complete file affected by this bug http://bazaar.launchpad.net/~gmazzurco89/olwebsuite/0.2/annotate/head%3A/src/OMWAudioOutput.lib.lzx than there is no reason to declare seek or play as private method... please do them public