WindowKeyPressFcn and datacursormode on

In the following exampleGUI:

If I set datacursormode on the WindowKeyPressFcn doesn't get called anymore.

I want the press of the spacebar to generate the random point as the pushbutton does. What can be done?

function exampleGUI
S.fh = figure('units','pixels','Pos',[400 400 200 200],...
              'Keypress',@fh_kp,'menu','none');
S.pb = uicontrol('Style','PushButton','Pos',[60 165 80 25],...
                 'String','Random point','Callback',@pb_call);
S.ax = axes('units','pixels','pos',[20 20 160 135],...
            'xlim',0:1,'ylim',0:1,'yticklabel','','xticklabel','',...
            'box','on');             
S.ln = line(-1,-1,'marker','.','markers',15,'markere','r','line','none');

datacursormode on % With this the WindowKeyPressFcn won't get called

      % Set new position of the point
      function pb_call(varargin)
          set(S.ln,'ydata',rand(1),'xdata',rand(1))
      end

      % Pressing spacebar calls pb_call
      function fh_kp(varargin)
          if strcmpi(varargin{2}.Key, 'space')
              pb_call
          end
      end
  end  

EDIT: Implementing datatips w/o setting datacursormode on, I added:

% Get datacursormode object
S.dtmode = datacursormode(S.fh); % Added

    % Set new position of the point
    function pb_call(varargin)
        % Remove datacursor
        removeAllDataCursors(S.dtmode,S.fh) % Added
        set(S.ln,'ydata', rand(1),'xdata',rand(1))
        % Create new
        S.dtip = createDatatip(S.dtmode, S.ln); % Added
        set(S.dtip,'Marker','none') % Added
    end

Thanks

Oleg