\setbeamertemplate{headline}
{%
    \placetarget
    \let\placetarget\relax
    \begin{beamercolorbox}[colsep=1.5pt]{upper separation line head}%
    \end{beamercolorbox}
    \begin{beamercolorbox}{section in head/foot}
        \vskip2pt
        \usebeamerfont{section in head/foot}\usebeamercolor[fg]{section in head/foot}%
        \color{fg!80!bg}
        % \ifnum\c@section=2%
        %     \hyperlink{Navigation#3}{{\usebeamertemplate{section in head/foot}}}%
        % \else%
        %     \hyperlink{Navigation#3}{{\usebeamertemplate{section in head/foot shaded}}}%
        % \fi}%
        \adjustbox{
            set depth=2pt,
            padding={5pt 5pt 5pt 5pt},%bgcolor=navigationTileOutline,
            rndframe={color=navigationTileOutline}{3pt 0pt 3pt 0pt},margin={10pt 0pt 0pt 0pt}
        }{%
            \hyperlink{basics}{\customhead{2}{Meer over tekst \& formules}}%
            \hspace{5pt}$ \cdot $\hspace{5pt}%
            \hyperlink{referenties}{\customhead{3}{Referenties}}%
            % \hspace{5pt}$ \cdot $\hspace{5pt}%
            % \hyperlink{theorem}{\customhead{4}{`Theorem'}}%
        }%
        \adjustbox{
            set depth=2pt,
            padding={5pt 5pt 5pt 5pt},
            bgcolor=exerciseTileBackground,
            rndframe={color=exerciseTileOutline}{0pt 3pt 0pt 3pt},
            margin={-1pt 0pt 10pt 0pt}
        }{%
            \hyperlink{oefeningen1}{\customhead{4}{Oefeningen}}%
        }%
        % \adjustbox{padding={3pt 5pt 3pt 5pt},bgcolor=navigationTileOutline,rndcorners=3pt,margin={10pt 0pt 10pt 0pt}}{
        %     `Theorem' en `Lemma'
        %     \hspace{5pt}$ \cdot $\hspace{5pt}
        %     Matrices en tabellen
        % }
        \adjustbox{
            %set depth=2pt,
            set depth=2pt,
            padding={5pt 5pt 5pt 5pt},%bgcolor=navigationTileOutline,
            rndframe={color=navigationTileOutline}{3pt 0pt 3pt 0pt},margin={10pt 0pt 0pt 0pt}
            % rndcorners={3pt 0pt 3pt 0pt}
        }{%
            \hyperlink{figuren}{\customhead{5}{Figuren}}%
            \hspace{5pt}$ \cdot $\hspace{5pt}%
            \hyperlink{matrices}{\customhead{6}{Matrices}}%
            \hspace{5pt}$ \cdot $\hspace{5pt}%
            \hyperlink{tabellen}{\customhead{7}{Tabellen}}%
        }%
        \adjustbox{
            set depth=2pt,    
            padding={5pt 5pt 5pt 5pt},
            % bgcolor=exerciseTileOutline,
            % rndcorners={0pt 3pt 0pt 3pt},
            bgcolor=exerciseTileBackground,
            rndframe={color=exerciseTileOutline}{0pt 3pt 0pt 3pt},
            margin={-1pt 0pt 10pt 0pt}
        }{%
        \hyperlink{oefeningen2}{\customhead{8}{Oefeningen}}%
        }
        \hfil
        Slides op texnicie.nl
        \hfil
        %\strut %AAAA
        \vskip4pt
    \end{beamercolorbox}%
    \begin{beamercolorbox}[colsep=1.5pt]{lower separation line head}%
    \end{beamercolorbox}%
}