CompositeCollections/ CollectionContainer binding issue

I'm trying to populate a listbox from an object like this:

class Data
{
public string Item1;
public List<ItemData> AdditionalItems;
}

class ItemData
{
override public string ToString() { return "Test";}
}

I have a content control that has it's datacontext set to an instance of
Data by another event:

<DockPanel>
<DockPanel.Resources>
.... (See below)
</DockPanel.Resources>
<ContentControl Name="Details" Content="{Binding }"/>
</DockPanel>

The ... is my DockPanel.Resources, if I use this it works:

<DataTemplate DataType="{x:Type dataata}">
<StackPanel>
<TextBlock Text="{Binding Path=Item1}"/>
<ListBox ItemsSource={Binding Path=AdditionalItems}"/>
</StackPanel>
</DataTemplate>

However, I want the TextBlock to actually be the first item in the list
instead of a separate element, so I tried:

<DataTemplate DataType ="{x:Type dataata}">
<ListBox>
<ListBox.ItemsSource>
<CompositeCollection>
<ListBoxItem>
<TextBlock Text={Binding Path=Item1}/>
</ListBoxItem>
<!--Problem Child below-->
<CollectionContainer Collection={Binding Path=AdditionalItems}/>
</CompositeCollection>
</ListBox.ItemsSource>

However, in this case I only get Item1 in the list. If I use the
"GreekHeroes" xml from the CompositeCollections SDK sample, it works fine
(after copying over the XmlDataSource, obviously):

<CollectionContainer Collection="{Binding Source={StaticResource
GreekHeroesData}}" />

The problem is I don't have a StaticResource to bind to, other things I've
tried are:

<CollectionContainer Collection="{Binding Source={Binding
Path=AdditionalItems}}" />

and

<CollectionContainer Collection="{Binding RelativeSource=/ParentData,
Path=AdditonalItems}" />

All with no success to date. I looked into using a DynamicResource, but
couldn't figure out how.

Any suggestions?

Heh, classic Avalon crap- they use a sample with a StaticResource that
makes it look simple, but doesn't work with bindings. I'm really pissed
at whoever makes these samples, they make it look easy but hide the
fact that it breaks for anything useful.

The problem you're running into is that CompositeCollection is not a
Freezable. In order to bind to the data context (where AdditionalItems
comes from) you need to have a chain of Freezables to your data
context.

Also note, that Binding to ElementNames will not be resolved as they
use the same path.

Options- Create your own Freezable CompositeCollection, or create a
collection that combines the two in your code.

Thanks for the advice, I'll look into Freezable and what that entails, in the
meantime I guess I'll just have 2 different treeviews, or do what I was doing
(make each of the 2 child TreeViewItems their own treeview control, though
the issue with this is I have to write custom selection bubbling code, and
I'm sure I'll run into other issues down the road.


"auto239436@hushmail.com" wrote:

> Options- Create your own Freezable CompositeCollection, or create a
> collection that combines the two in your code.