WPF: Bug i listview datacontext?

Det bliver lige på engelsk, da stackoverflows site er lige så talentløs som WPF.

When i populate the DataContext collection, which is a ObservableCollection with the type OverviewListItem bound to my listview, all works fine. But when i later update some properties of the OverviewListItem class, the listview does not update until i scroll to the bottom and up again, and only some items get updated. The only way i could get it to work was first removing the item from the collection, change the properties and add it again.


OverviewListCollection = new ObservableCollection<OverviewListItem>();
OverviewListview.DataContext = OverviewListCollection;


Adding the items at first:


OverviewListItem itm = new OverviewListItem();
itm.Image = dataItm == null ? null : dataItm.FlagImage;
itm.CurrencyCode = R.CurrencyCode;
itm.Description = R.Description == null ? string.Empty : R.Description;
itm.Rate = string.Empty;
itm.Date = string.Empty;
   
OverviewListCollection.Add(itm);


And the updating:


DailyRate foundRate = dailyRatesList.Find(delegate(DailyRate d) { return d.CurrencyCode == itm.CurrencyCode; });
    OverviewListItem foundItm = OverviewListCollection.First(delegate(OverviewListItem d) { return d.CurrencyCode == itm.CurrencyCode; });
       
OverviewListCollection.Remove(foundItm);
       
foundItm.Rate = CurrencyConverter.Convert(decimal.Parse(FromAmountBox.Text.Trim()), fromRate.DKKRate, foundRate.DKKRate).ToString("N");
foundItm.Date = foundRate.Date.ToShortDateString();
       
OverviewListCollection.Add(foundItm)


If i update without add/remove. It won't refresh the list. Is this a WPF bug? if so, i can post it on Microsoft Connect with all the other bugs i've ran into!!!