'Set the chart object for the chartsheet.
Args:
chart:  Chart object.
Returns:
chart:  A reference to the chart object.'

def set_chart(self, chart):

    chart.embedded = False
    chart.protection = self.protection
    self.chart = chart
    self.charts.append([0, 0, chart, 0, 0, 1, 1])
    return chart
