<?xml version="1.0" encoding="utf-8"?>
<mx:Application
    xmlns:mx = "http://www.adobe.com/2006/mxml"
    layout   = "vertical"
>

<mx:Style>
        Application {
            background-gradient-colors: #ffffff, #000000;
        }
        .hogeStyle {
            color : #333333;
            font-size: 20;
        }
    </mx:Style>

<mx:Script>
        <![CDATA[
            import mx.controls.*;
            import mx.core.UIComponent;
            /**
             * サンプル XML データ
             */
            private static const SAMPLE_XML:XML =
                <component>
                    <Button
                        id        = 'hoge'
                        name      = 'hoge'
                        x         = '100'
                        y         = '100'
                        width     = '200'
                        height    = '50'
                        label     = 'ほげ'
                        styleName = 'hogeStyle'
                     />
                    <TextInput
                        id        = 'fuga'
                        name      = 'fuga'
                        x         = '100'
                        y         = '170'
                        width     = '200'
                        height    = '20'
                     />
                    <TextArea
                        id        = 'piyo'
                        name      = 'piyo'
                        x         = '100'
                        y         = '200'
                        width     = '200'
                        height    = '300'
                     />
             </component>;
            /**
             * @private
             * 子生成
             */
            protected override function createChildren():void {
                super.createChildren();
                var attributeName :XML;
                var child         :XML;
                var xml           :XML     = SAMPLE_XML;
                var list          :XMLList = xml.children();
                var componentName :String;
                var properties    :Object;
                for each(child in list) {
                    componentName = child.localName().toString();
                    properties    = new Object();
                    for each(attributeName in child.attributes()) {
                        properties[attributeName.localName()] = attributeName.toString();
                    }
                    generateComponent(componentName, properties);
                }
            }
            /**
             * @private
             * Flex Control の生成
             */
            private function generateComponent(componentName:String, properties:Object):void {
                var clazz     :Class       = getClassByAlias(componentName);
                var newObject :UIComponent = new clazz();
                var xml       :XML         = describeType(clazz);
                var propDesc  :XML;
                var list      :XMLList;
                var prop      :String;
                var propType  :String;
                for(prop in properties) {
                    list = xml.factory.accessor.(@name == prop);
                    if(!list) {
                        list = xml.factory.variable.(@name == prop);
                    }
                    if(list && list.length() > 0) {
                        propDesc = list[0] as XML;
                        propType = propDesc.@type.toString();
                        switch(propType) {
                            case "Object":
                            case "String":
                                newObject[prop] = properties[prop];
                                break;
//                            case "Date":
//                                newObject[prop] = properties[prop];
//                                TODO:日付のパース
//                                break;
                            case "Number":
                                newObject[prop] = parseFloat(properties[prop]);
                                break;
                            case "int"  :
                            case "uint" :
                                newObject[prop] = parseInt(properties[prop]);
                                break;
                        }
                    }
                }
                addChild(newObject);
            }
            registerClassAlias("Button",      Button      );
            registerClassAlias("CheckBox",    CheckBox    );
            registerClassAlias("ColorPicker", ColorPicker );
            registerClassAlias("ComboBox",    ComboBox    );
            registerClassAlias("Image",       Image       );
            registerClassAlias("Label",       Label       );
            registerClassAlias("Text",        Text        );
            registerClassAlias("TextArea",    TextArea    );
            registerClassAlias("TextInput",   TextInput   );
            registerClassAlias("RadioButton", RadioButton );
        ]]>
    </mx:Script>
</mx:Application>

MXML Test 081225 XML から Flex Control を動的生成するサンプル