Items in ItemsControl not constrained to container with ItemsHost=true

Question

I have what I think is a simple control.   For the purposes of this sample I have reduced it to the following

<ItemsControl x:Class="TestControl.MyItemsControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid Margin="20,0,20,0">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <TextBlock Grid.Row="0" Text="MyText" />

        <ItemsControl Grid.Row="1">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel IsItemsHost="True"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
        </ItemsControl>
    </Grid>
</ItemsControl>

In the designer this looks right. Text on top.  Items collection on the bottom. Margins on the side. However, when I put it my application the items are not constrained to the margins. The text is just not the items. My application looks like:

<Window x:Class="TestControl.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:tc="clr-namespace:TestControl"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <tc:MyItemsControl>
            <TextBlock Text="Test1" />
            <TextBlock Text="Test2" />
        </tc:MyItemsControl>
    </Grid>
</Window>

The end result looks like:

So why does the text from the items control not stay within the margins?   Like the TextBox does?

---

sjz

Answer 1

Hi sjz,

I don't get why you can create a custom itemscontrol in your way.

It is seemed that you create a UserControl as custom ItemsControl, but UserControl just can't inherit form ItemsControl. You should need to create a CustomControl to achieve you goal I think. But also you are not create a CustomControl. At the same time, the MyItemsControl you create without any binding action and Denpendency property, no way you can create a worked UserControl. Here is a simple sample about how to create a UserControl within ItemsControl for you to reference:http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b9c27238-145b-494f-8d22-8fa1bda336ad

If I misunderstand you or you have any additional questions, please feel free to let me know.

Have a nice day.

---

Annabella Luo[MSFT]
MSDN Community Support | Feedback to us

Answer 2

Hi sjz,

Have hear from you for a week, so I'm temprorarily marking this as answer, if you have any new finds, please feel free to let me know.

Have a nice day.

---

Annabella Luo[MSFT]
MSDN Community Support | Feedback to us