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i just want to know what kind of event is fired when the column header in a Table is clicked
Unfortunately, Vaadin 6.3 doesn't have that kind of feature. Upcoming version 6.4 will contain such a feature, see ticket #4515.
The feature is already implemented in the 6.4 nightlies, and can be tested in the demo: http://demo.vaadin.com/6.4-nightly/sampler#TableClickHandlers