function helpcbk(hObject, eventdata, handles) %#ok<INUSD>
helpdlg([...
    ' The main part of the window is occupied by two rows of panels.      '; ...
    ' The top row shows the whole data set at one time point,             '; ...
    ' the bottom row shows only selected components. Components can be    '; ...
    ' selected in any combination, using the push buttons at the right.   '; ...
    '                                                                     '; ...
    ' The horizontal plot at the bottom shows time-courses of the         '; ...
    ' selected components. You can click on it to jump to any time point  '; ...
    ' (be sure not to click on the plotted lines - it will not work).     '; ...
    '                                                                     '; ...
    ' The CSD button in the upper left corner switches the view between   '; ...
    ' LFP (potentials) and CSD. For ICA on CSD only the top row is        '; ...
    ' affected. The Play button starts the animation.                     '; ...
    '                                                                     '; ...
    ' The scrollbar in the lower right corner can be used to adjust       '; ...
    ' the limits of the color scale.                                      '; ...
    '                                                                     '; ...
    ' Component viewer, (c) 2009 Szymon Leski                             '; ...
    ' Feel free to email me at s.leski@nencki.gov.pl                      '; ...
    '                                                                     ']);
end % of function