How "Tab" brings widgets into focus

[varun_shrivastava <shrivastavavarun yahoo co in>]

hi
i tried to find out how pressing Tab key brings widgets into focus, but
couldn;t find out.

For eg if i have created three spin button widget and are held by a
container VBox.
then pressing tab key switches b/w the spin buttons. I looked through the
source code of gtkspinbutton, but couldn't find where key press event
related to Tab key is being handled.

 
kindly help

varun
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