I'm trying to code an app in Flash Builder 4 which loads a bitmap, then allows zooming centered on a point clicked by the mouse. Trouble is, to keep the bitmap aligned with the stage as it scales up or down, seems I need to use the MatrixTransformer.matchInternalPointWithExternal method (see http://www.flashandmath.com/howtos/zoom/ or http://www.actionscript.org/forums/showthread.php3?t=181202). Apparently, this method is only available when using Actionscript with Flash, not with the Flash Builder IDE. Is this correct? If so, what would be the equivalent code / workaround?