Detailed Description
KTabCtl is very similar to QTabDialog, with the following differences:
To avoid confusion, the API is almost identical with QTabDialog.
does not create any button, therefore KTabCtl is not limited to dialog
boxes. You can use it whereever you want.
emits the signal tabSelected(int pagenumber) when the user selects one
of the tabs. This gives you the chance to update the widget contents
of a single page. The signal is emitted _before_ the page is shown.
Very important, if the contents of some widgets on page (a) depend on
the contents of some other widgets on page (b).