Show "connecting" icon on the view

Hi,
Please give me a hint how to do the following:
I would like to show connecting icon with the label "connecting" next to it in the center of the existing view when I perform loading data from Internet in my application. After the operation is completed I would like to hide this dialog.
Is here any recommended way of doing so?
Thanks!

Call setCloseAction(new TabCloseAction()) on CustomTab which TabCloseAction inherits AbstractAction class as neither setCloseable nor setShowSelectedCloseButton is need.

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