XAML: Import namespace for controls

To use your own user control, remember to import namespace:

    xmlns:main="clr-namespace:TestMemoryLeak"

Then you can use your control:

<Canvas HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
    <ListBox Width="300" Margin="0,0,0,0" Name="TestListBox">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <main:ShapeListControl ListID="{Binding Path=ListID}" />
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Canvas>