The onAction event will trigger a page-reload, as the currentpage parameter
is passed from the Grid to the Pager:

 @Component(parameters =
    { "source=dataSource", "rowsPerPage=rowsPerPage",
"currentPage=currentPage", "zone=zone" })
    private GridPager pager;


It will also be 'reflected back to the grid component' once it changes, as
the Grid component defines the parameter as 'persist':

 @Persist
    private Integer currentPage;

The next page reload will take the newly selected currentpage as starting
point.



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