Databinding PivotItems to ObservableCollection on WP7 - windows-phone-7

Question

I want to databind an ObservableCollection to a Pivot contronl in WP7 so that each object in my ObservableCollection becomes a PivotItem. This is the code I use:
<controls:Pivot x:Name="MainPivot" ItemsSource="{Binding Persons}">
<controls:Pivot.HeaderTemplate>
<DataTemplate>
<TextBlock Text="{Binding FullName}"/>
</DataTemplate>
</controls:Pivot.HeaderTemplate>
<controls:Pivot.ItemTemplate>
<DataTemplate>
<StackPanel Margin="0,0,0,17" Width="432">
<TextBlock Text="{Binding FirstName}"/>
<TextBlock Text="{Binding LastName}"/>
<TextBlock Text="{Binding HomeTown}"/>
</StackPanel>
</DataTemplate>
</controls:Pivot.ItemTemplate>
</controls:Pivot>
This works and with tre items in my ObservableCollection I get three PivotItems. But when everything gets loaded the binding inside the DataTemplate won´t get updated. It is only when I scroll to the next PivotItem that the FirstName, LastName and HomeTown gets loaded.
Why is that? What am I missing?
Thanks

Answer 1

Check this discussion:
DataBound Pivot control is not creating the first PivotItem

Answer 2

I had the same problem, but the workaround with setting SelectedIndex=1 didn't suit me.
I found the other solution: when you adding the Item to your Persons collection you should first create a temp element and only when you fill all data add it to your Persons collection.
Person tempPers = new Person() { FullName = "Abduvaliev Edem", FirstName = "Edem", LastName = "Abduvaliev", HomeTown = "Sevastopol"};
Pesrons.Add(tempPers);

Answer 3

After doing a simple test i cannot reproduce this behavior. I i put a breakpoint inside the get block of the equivalent of FirstName with two items in my ObservableCollection i get two hits.
How did you detect that it is not bound? You cannot see the "next" pivotitems content, so how?

Answer 4

Sounds like there's some problem with the loading order - or with the notification code.
Check that you are correctly firing the PropertyChanged event when you set the properties on each of your FirstName, LastName and HomeTown members.

Answer 5

Here's how I do it. The problem for me is that the collection updates asynchronously in response to a web method call.
void Page_Loaded(object sender, RoutedEventArgs e)
{
_log.Debug("Page loaded.");
var vm = this.GetViewModel<TrendsViewModel>();
if (!vm.IsInitialized)
{
vm.PivotItems.CollectionChanged += (origin, args) =>
{
this.PivotControl.DataContext = null;
this.PivotControl.DataContext = vm;
};
vm.Initialize(this);
}
}
The key is hooking up an observer of the collection to which the Pivot items are bound and giving the data context a shake when it updates.