textbox in showcase lower right corner, has a dragger to resize the textbox

in the showcase
http://gwt.google.com/samples/Showcase/Showcase.html#!CwBasicText
the textbox lower right corner has a dragger to resize the textbox, how to do it?

 I try

TextArea ta = new TextArea();
 ta.setCharacterWidth(80);
 ta.setVisibleLines(5);

but the textbox generated has no such a resize dragger.

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