Applying filters with AS3

//First we declare two filter instances one glowfilter and naming it "filt"
//the other is a dropshadow filter and we name it "filt_shadow" 
var filt:GlowFilter = new GlowFilter;
var filt_shadow:DropShadowFilter = new DropShadowFilter;

//here we add some properties to the two filters, the glow filter we give a color. 
filt.color = 0xFF0000;

//and how much it should blur. 
filt.blurX = 7;
filt.blurY = 7;

//then the dropshadow filter, also how much it should blur on the object. 
filt_shadow.blurX = 4;
filt_shadow.blurY = 4;

//and finally an alpha, the alpha goes from 1 to 0, 1 being fully visible and 0 is transparent, then of cause .5 is just in between. 
filt_shadow.alpha = .4;

//here we add two eventlisteners to the ball, to listen to when the mouse button is down and when its released again,
//if the mouse is down we call the function "dragMovie" and if the mouse is up we call the "dropMovie". 
ball.addEventListener(MouseEvent.MOUSE_DOWN, dragMovie);
ball.addEventListener(MouseEvent.MOUSE_UP, dropMovie);

//this is the dragMovie function
function dragMovie(event:MouseEvent):void
{
    //tells flash to start dragging the object we refer to. 
    this.startDrag();
    //this line adds our two filters to the object, notice we use [ ] and not ( ), also separate the two filters by a comma. 
    this.filters = [filt,filt_shadow];
}

//this is the dropMovie function. 
function dropMovie(event:MouseEvent):void
{
    //tells flash to stop dragging the object. 
    this.stopDrag();
    //setting the filters to none. 
    this.filters = [];
}