Here we have two UpdatePanels defined with the second one including a
declaration for an AsyncPostBackTrigger that wires up the click event of the
button contained in the other UpdatePanel. When the user clicks the button,
the second UpdatePanel will refresh its contents.
In my page,when the user clicks the button, the updToolbar UpdatePanel
refresh its contents too, but I want not refresh contents when the user
clicks the button, only refresh updDynamicContent UpdatePanel, not updToolbar.