| Creating and Extending Flex 2 Components > Creating ActionScript Components > Creating Advanced Visual Components in ActionScript > Example: Creating a composite component | |||
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Composite components are components that contain multiple components. They might be graphical assets or a combination of graphical assets and component classes. For example, you can create a component that includes a button and a text field, or a component that includes a button, a text field, and a validator.
When you create composite components, you should instantiate the controls inside the component's class file. Assuming that some of these controls have graphical assets, you must plan the layout of the controls that you are including, and set properties such as default values in your class file. You must also ensure that you import all the necessary classes that the composite component uses.
Because the class extends one of the base classes, such as UIComponent, and not a controls class like Button, you must instantiate each of the controls as children of the custom component and arrange them on the screen.
Properties of the individual controls are not accessible from the MXML author's environment unless you design your class to allow this. For example, if you create a component that extends the UIComponent class and uses a Button and a TextArea component, you cannot set the Button control's label text in the MXML tag because you do not directly extend the Button class.
Flex 2.01
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