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Hi ........ sorry not making it clear... I need a tab that should look like the pro support button on the left side of vaadin forum site. My requirement is like that. I need a button that should remain at a fixed position and even when we scroll down on the page, just like pro support button/tab.
Other than that, you could just use the AbsoluteLayout to position your button on the screen. Then just add a transparent (Reindeer.PANEL_LIGHT) panel to the absolute layout (100% size) to provide the scrolling which is usually done by the main window.