private Treecell autoFirstCell() {
Treecell cell = (Treecell) getFirstChild();
if (cell == null) {
cell = new Treecell();
cell.applyProperties();
cell.setParent(this);
}
return cell;
}
/**
* Returns the image of the {@link Treecell} it contains, or null if no such cell.
*
* @since 5.0.8
*/
public String getImage() {
final Treecell cell = (Treecell) getFirstChild();
return cell != null ? cell.getImage() : null;
}