@Override
    public void setSelectedContent(final @NotNull Content content) {
      if (mySelected != null) {
        removeFromSelection(mySelected);
      }
      mySelected = content;
      ContentManagerEvent e = new ContentManagerEvent(this, content, myContents.indexOf(content), ContentManagerEvent.ContentOperation.add);
      myDispatcher.getMulticaster().selectionChanged(e);
    }
@Override
    public void setSelectedContent(final @NotNull Content content)