// Create an init Object used to configure behavior. first param is the particle
// XML Config file that you exported from fx- Particle-Designer. The second param is
// the particle Texture.</pre>
var initObj:MotionParticleSpriteInitObject = new MotionParticleSpriteInitObject
(
     XML(new PARTICLE()),
     myAssetManager.getTexture( AssetConstants.PARTICLE )
 );
 
// Store the Clipboard XML
var xmlPastedFromClipboard:XML = PASTE_HERE;
 
// Create the MotionParticSprite and pass the XML and the Init Obj.
var motionParticleSprite:MotionParticleSprite = new MotionParticleSprite( xmlPastedFromClipboard , initObj);
addChild( motionParticleSprite );
motionParticleSprite.initialize(); // this takes care of making the particle ready.
motionParticleSprite.play(); // this starts the particle.