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I know that the Windows Phone 7 ListBox use VirtualizingStackPanel by default to optimize memory.
However, when I add more items to the view model, the listbox doesnot show those new items. I must scroll up, then down to see them.
My view model does implement IList
Many articles around have this problem, like this guide
How to fix this ?
Does you viewmodel implement the INotifyPropertyChanged interface and raise the PropertyChanged event when you’ve added more items?
A better solution is to make the viewmodel property you bind against an ObservableCollection. This class will automatically raise the PropertyChanged event when items are added/removed from the collection.