trying to reset data do nothing

[pedefe]

Hello,

I display a cloud of points as bubblechart.
I want to reset only data.
So I do :
compassCalibCurve = chart( bubblechart, { ...
Then I display datas. (it works well).
Then I want to reset data:
compassCalibCurve.data = []
compassCalibCurve.renderToDOM(compassCalibDiv)
But nothing occurs. I see rawgraphs-core displayaing the previous datas.
Best regards.