In ActionScript Use A Container's addChild Function To Add A Component To Your Flex Application

An alternative to using mx:States to add or remove components from your Flex application is to use the Container class addChild (or addChildAt) and removeChild (or removeChildAt) functions. Refer to the Flex 2.0 Language Reference's description of the Container class for complete details.

The Container class is the abstract parent class for several mxml container components such as panel, form, and box. The container class has an addChild function, which its child classes such as Form inherit. You can use the addChild function to add a component to your container. You can then use removeChild to remove the component from the container.

If you want to add your component to a specific place on the Container, you can use the addChildAt function. This function takes a second argument that identifies where to add the component. If you specify 0 for this argument, your component will be added before the other components.

You can view a Flex example that demonstrates using addChildAt and removeChild. Right click on the application to view the source code.