@Override
  public @NotNull ActionCallback requestFocus(final Content content, final boolean forced) {
    final Content toSelect = content == null ? getSelectedContent() : content;
    if (toSelect == null) return ActionCallback.REJECTED;
    assert contents.contains(toSelect);
    JComponent preferredFocusableComponent = toSelect.getPreferredFocusableComponent();
    return preferredFocusableComponent != null ? getFocusManager().requestFocusInProject(preferredFocusableComponent, myProject) : ActionCallback.REJECTED;
  }
@Override
  public @NotNull ActionCallback requestFocus(final Content content, final boolean forced)