/**
  * Adds the given component to the left side of this {@code BottomBar} followed by the given an
  * empty space of the given pixel width.
  *
  * @param toolToAdd the tool to add to this {@code BottomBar}.
  * @param spacer_pixels the amount of space to post-pend the added component with.
  */
 public void addComponentToLeft(JComponent toolToAdd, int spacer_pixels) {
   fBottomBar.addComponentToLeft(toolToAdd, spacer_pixels);
 }
 /**
  * Adds the given component to the left side of this {@code BottomBar}.
  *
  * @param toolToAdd the tool to add to this {@code BottomBar}.
  */
 public void addComponentToLeft(JComponent toolToAdd) {
   fBottomBar.addComponentToLeft(toolToAdd);
 }