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Chart won't refresh after OnPropertyChanged


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I'm using the MVVM pattern with the XAML binding as follows:



class ChartViewModel


private ObservableCollection _strategyList;

public ObservableCollection StrategyList {get{return _strategyList}}

public ChartViewModel() {

foreach (strategy in _strategyList) strategy.PropertyChanged += delegate {OnPropertyChanged("StrategyList")};



class StrategyViewModel


public string Name {get;set;}

public ObservableCollection Points


So the XAML will list down the first level collection as series and then plot the curve for each series. The problem is, when I make changes to Points, it doesn't get updated. Anyone can help?

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