This is true but keep in mind that if you use inheritance to extent a
widget your object must follow the "Is A..." rule.
Il you extent a button with a new child class "MyButton" or
"MyToolbar" you inherit all present and future methods, your object
can be cast and used as a parent representative, i
When you want to design your own widget that modifies some data, you can
combine more than one widget in such a Composite, additionally implement for
example a HasValueChangeHandlers<...> interface, and much more. That helps
to isolate all this into one class and you can use this as a bigger blo
Why would I wish to extend Composite instead of just extending the
Widget that I'm wrapping in the Composite?
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