Vista - Custom Data Binding with ItemsControl ControlTemplate Problem

Hi~~ I encounter a problem.

I want to use ItemsControl and Binding my list data to ItemsSource
such as
<ListBox ItemsSource={Binding myData...etc}/>

then define DataTempalte for myData
<DataTemplate TargetType={x:Type local.myData}>
<Rectangle Fill="Red"/>
</DataTempalte>

And I define a new Template for ListBox
<Style TargetType="{x:Type ListBox}">
....
<ControlTemplate>
<local:MyPanel IsItemsHost="true"/>
</ControlTempalte>
</Style>

I want to layout rectangles( represent mydata by DataTemplate) on
MyPanel
So I override ArrangeOverride Function and write code below

foreach( UIElement u in Children)
.....etc

But I find that I get all "ContentPresenter", not Rectangles.
If there's any way to get real controls from MyPanel?

Thanks

The fact that you are getting ContentPresenter is extremelly normal and
corresponds to the actual design of the ItemsControl...

Each item in the ItemsControl is represented by an Item Container, now
the Item Container Template MUST contain a ContentPresenter, since it
is the ContentPresenter that will be the control in charge of
displaying your data.

To obtain you rectangle object, what you must do is get the first child
of the ContentPresenter... The ContentPresenter's child will be the
root element of the data template used to display your data.

To get the child of the ContentPresenter, you can use
VisualTreeHelper.GetChild(u, 0)




HolaMan wrote:
> Hi~~ I encounter a problem.
>
> I want to use ItemsControl and Binding my list data to ItemsSource
> such as
> <ListBox ItemsSource={Binding myData...etc}/>
>
> then define DataTempalte for myData
> <DataTemplate TargetType={x:Type local.myData}>
> <Rectangle Fill="Red"/>
> </DataTempalte>
>
> And I define a new Template for ListBox
> <Style TargetType="{x:Type ListBox}">
> ...
> <ControlTemplate>
> <local:MyPanel IsItemsHost="true"/>
> </ControlTempalte>
> </Style>
>
> I want to layout rectangles( represent mydata by DataTemplate) on
> MyPanel
> So I override ArrangeOverride Function and write code below
>
> foreach( UIElement u in Children)
> .....etc
>
> But I find that I get all "ContentPresenter", not Rectangles.
> If there's any way to get real controls from MyPanel?
>
> Thanks

Dear Marcus
I got it...
Thanks you very much :-)