Returns an instance of the UI delegate for the specified component.
Each subclass must provide its own static createUI
method that returns an instance of that UI delegate subclass.
If the UI delegate subclass is stateless, it may return an instance
that is shared by multiple components. If the UI delegate is
stateful, then it should return a new instance per component.
The default implementation of this method throws an error, as it
should never be invoked.
Paints the specified component appropriate for the look and feel.
This method is invoked from the ComponentUI.update method when
the specified component is being painted. Subclasses should override
this method and use the specified Graphics object to
render the content of the component.
Returns the specified component's preferred size appropriate for
the look and feel. If null is returned, the preferred
size will be calculated by the component's layout manager instead
(this is the preferred approach for any component with a specific
layout manager installed). The default implementation of this
method returns null.
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