Re: BGOK X-Y chart changes problem

Here are the news :

This only works if the model don't change at all. It just adds a
descriptor which descibe how to display the line.

addLine: myBG_ChartDataSetDescription toMyChartNamed: aSymbol
| widget newArray |
widget := self widgetAt: aSymbol.
newArray := widget descriptors copyWith: myBG_ChartDataSetDescription.
widget descriptors: newArray.
self mainWindow display.
^self

.

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