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Scenario - If we have multiple level of parents for chart widget and If we dispose bottom most(top most is chart) widget by invoking dispose chart widget get disposed without calling chart.dispose(). Any subsequent call to dispose never calls dispose for it's children. So checking if chart disposed in the dispose method never give an opportunity to children dispose in the above Scenario. I have added chart disposed safety check at Title because this was causing the issue #289.
Fixes #372