[flexcoders] how to add product to shipping cart??

[karn.anand]

hi,
everyone there,
i meed some help.
actually i am building a shopping cart bt i dont know what function or script 
should define to button for adding products to cart.I am calling product from a 
external xml file.Cart is defined here.



<?xml version="1.0" encoding="utf-8"?>

<mx:VBox xmlns:mx="http://www.adobe.com/2006/mxml"; 
    xmlns:productsView="productsView.*"
    horizontalAlign="right"
    paddingTop="8"
    paddingBottom="8"
    paddingRight="4"
    paddingLeft="4"
    horizontalScrollPolicy="off"
    verticalScrollPolicy="off">
    
    <mx:Script>
        <![CDATA[
        
        import mx.controls.Alert;
        
        import samples.flexstore.Product;
        import samples.flexstore.ProductListEvent;
        
        [Bindable]
        public var numProducts:int=0;
        
        [Bindable]
        private var total:Number = 0;

        private const SHIPPING:Number = 1.99;
        
        private function productListEventHandler(event:ProductListEvent):void
        {
            switch (event.type)
            {
                case ProductListEvent.ADD_PRODUCT:
                    event.product.qty = 0;  
                             
                case ProductListEvent.DUPLICATE_PRODUCT:
                    event.product.qty++;
                    total += event.product.price;
                    numProducts++;
                    break;            
                case ProductListEvent.PRODUCT_QTY_CHANGE:
                case ProductListEvent.REMOVE_PRODUCT:
                    var items:Array = productList.items;
                    total = 0; 
                    numProducts = 0;
                    for (var i:int=0; i < items.length; i++)
                    {
                        var product:Product = items[i].product;
                        total += product.qty * product.price;
                        numProducts += product.qty;
                    }       
                    break;
                default:
                    break;
            }
        }
        
        ]]>
    </mx:Script>
    
    <mx:CurrencyFormatter currencySymbol="$" id="cf" precision="2"/>
    
    <mx:Label width="100%" text="Your Shopping Cart" styleName="sectionHeader"/>
        
    <productsView:ProductList id="productList" height="100%" width="100%"
        newItemStartX="-100" newItemStartY="-100" 
        addProduct="productListEventHandler(event)"
        duplicateProduct="productListEventHandler(event)"
        productQtyChange="productListEventHandler(event)"
        removeProduct="productListEventHandler(event)"
        showQuantity="true"
        />
    
    <mx:Form verticalGap="0" paddingRight="0">

        <mx:FormItem label="Total:">

            <mx:Label width="70" text="{cf.format(total)}" textAlign="right"/>

        </mx:FormItem>

        <mx:FormItem label="Shipping:">

            <mx:Label width="70" text="{cf.format(numProducts * SHIPPING)}" 
textAlign="right"/>

        </mx:FormItem>

        <mx:FormItem label="Grand Total:" fontWeight="bold">

            <mx:Label width="70" text="{cf.format(total + (numProducts * 
SHIPPING))}" textAlign="right"/>

        </mx:FormItem>

    </mx:Form>

    <mx:Button label="Submit Order"  click="Alert.show('This feature is not 
implemented in this sample', 'Submit Order')"/>

</mx:VBox>