"Refresh" Pivot Control with Mvvm-light toolkit for WP7 - windows-phone-7

Question

I have in my Xaml a pivot control :
<controls:Pivot ItemsSource="{Binding ObjectList}">
<controls:Pivot.HeaderTemplate>
<DataTemplate>
<TextBlock />
</DataTemplate>
</controls:Pivot.HeaderTemplate>
<controls:Pivot.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Value1}" />
<TextBlock Text="{Binding Value2}" />
</StackPanel>
</DataTemplate>
</controls:Pivot.ItemTemplate>
</controls:Pivot>
My ViewModel is :
public class MyObject
{
public string Value1 { get; set; }
public string Value2 { get; set; }
}
public class MyViewModel : ViewModelBase
{
public const string ObjectListPropertyName = "ObjectList";
private ObservableCollection<MyObject> _objectList;
public ObservableCollection<MyObject> ObjectList
{
get
{
return _objectList;
}
private set
{
if (_objectList == value)
return;
_objectList = value;
RaisePropertyChanged(ObjectListPropertyName);
}
}
private DispatcherTimer timer;
public MyViewModel()
{
ObservableCollection<MyObject> collection = new ObservableCollection<MyObject>
{
new MyObject {Value1 = "One"},
new MyObject {Value1 = "Two"},
new MyObject {Value1 = "Tree"}
};
ObjectList = collection;
timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(2)};
timer.Tick += timer_Tick;
timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
foreach (MyObject myObject in _objectList)
{
myObject.Value2 = "Something";
}
Application.Current.RootVisual.Dispatcher.BeginInvoke( () => RaisePropertyChanged(ObjectListPropertyName));
}
}
When the timer_tick is reached, I supposed the pivot control to refresh with the new values ... but I can't see any changes.
What do I miss ?
Thanks in advance for your help

Answer 1

I'm guessing that possibly updating the members of the list without updating the list itself is the problem. When you raise the property changed event - it is for the entire collection. The collection is still pointing to an equal reference of itself, despite the fact that the members have changed.
Try placing a breakpoint in the setter and see if the property changed event is fired.