import mx.controls.Button;
import mx.events.FlexEvent;

private var myButton:Button;

private function creationCompleteHandler():void

{
    // Create a Button instance and set its label 
    myButton = new Button();
    myButton.label = "I'm a button!";
    
    // Get notified once button component has been created and processed for layout


    myButton.addEventListener (FlexEvent.CREATION_COMPLETE, buttonCreationCompleteHandler);
    
    // Add the Button instance to the DisplayList
    addChild (myButton);
} 

/*private function buttonCreationCompleteHandler ( evt:FlexEvent ):void

{
    // Center the button 
    myButton.x = parent.width/2 - myButton.width/2;
    myButton.y = parent.height/2 - myButton.height/2;
}*/