Adds a new contents widget tab into the contents tab.
        
        :return     <QWebView>

def addContentsWidget( self ):
        """
        Adds a new contents widget tab into the contents tab.
        
        :return     <QWebView>
        """
        curr_widget = self.currentContentsWidget()
        widget = QWebView(self)
        page = widget.page()
        page.setLinkDelegationPolicy(page.DelegateAllLinks)
            
        self.uiContentsTAB.blockSignals(True)
        self.uiContentsTAB.addTab(widget, 'Documentation')
        self.uiContentsTAB.setCurrentIndex(self.uiContentsTAB.count() - 1)
        self.uiContentsTAB.blockSignals(False)
        
        self._currentContentsIndex = self.uiContentsTAB.count() - 1
        
        if curr_widget:
            widget.setUrl(curr_widget.url())
        
        widget.titleChanged.connect(self.refreshUi)
        widget.linkClicked.connect(self.__gotoUrl)
        
        return widget