def write_title_rich(title, horiz = nil, layout = nil, overlay = nil) # :nodoc:
      @writer.tag_elements('c:title') do
        # Write the c:tx element.
        write_tx_rich(title, horiz)
        # Write the c:layout element.
        write_layout(layout, 'text')
        # Write the c:overlay element.
        write_overlay if overlay
      end
    end
def write_title_rich(title, horiz = nil, layout = nil, overlay = nil) # :nodoc:
      @writer.tag_elements('c:title') do
        # Write the c:tx element.
        write_tx_rich(title, horiz)
        # Write the c:layout element.
        write_layout(layout, 'text')
        # Write the c:overlay element.
        write_overlay if overlay
      end
    end
Write the <c:title> element for a rich string.