Assuming "p1" is your plane then the world position of the top left

 var tl:Vector3D = new Vector3D( -p1.width*0.5, 0, -p1.height*0.5); //top
left

var vtxPos:Vector3D = p1.sceneTransform.transformVector(tl);

best way to check is to add a sphere to to the scene at that "vtxPos"
position.

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