This ones a little complicated.
I have a plugin video player
width="500" height="282" align="center" edge="center"
I have a close button plugin
<plugin name="closebutton" url="%SWFPATH%/skin/close60.png" x="0" y="0" width="40" height="40" align="righttop" edge="center" />
if I set the parent of closebutton to the video player is is NOT in the correct place. lefttop for example, its hanging down around the bottom left of the plugin.
This ONLY happens if I set parent, not if it was pre-existing ie parent="videoplugin"