Use the Free Transform tool or the setSize() method to resize component
instances. You can call the setSize() method from any component instance (see
UIComponent.setSize()) to resize it. The following code resizes an instance of
the List component to 200 pixels wide and 300 pixels high:
aList.setSize(200, 300);
A component does not resize automatically to fit its label. If a component instance that has been added to a document is not large enough to display its label, the label text is clipped. You must resize the component to fit its label.
For more information about sizing components, see their individual entries in the ActionScript 3.0 Reference for the Adobe Flash Platform.