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Let's say that when a user clicks on something, perhaps selecting something from a DataTable or DataGrid, you want to call some server side code, and then popup a modal panel which needs to show content based on the new state setup by your server side call. In my case I have a DataGrid showing a number of items, and when a user clicks on an item I want to set the current selected item on a Seam component on the server, and then popup a modal panel to display detailed information about the item, and provide the user some actions within the modal panel.