code: protected JButton createLeftOneTouchButton() {
          SeaGlassArrowButton b            = new SeaGlassArrowButton(SwingConstants.NORTH);
          int                 oneTouchSize = lookupOneTouchSize();
  
          b.setName("SplitPaneDivider.leftOneTouchButton");
          b.setMinimumSize(new Dimension(oneTouchSize, oneTouchSize));
          b.setCursor(Cursor.getPredefinedCursor(
              splitPane.getOrientation() == 
                  JSplitPane.HORIZONTAL_SPLIT ? 
                          Cursor.W_RESIZE_CURSOR:Cursor.N_RESIZE_CURSOR));
          b.setFocusPainted(false);
          b.setBorderPainted(false);
          b.setRequestFocusEnabled(false);
          b.setDirection(mapDirection(true));
  
          return b;
      }
docs: Creates and return an instance of JButton that can be used to collapse
  the left/top component in the split pane.
  
  @return a one-touch button.