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Editorial Team
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Asked: 2026-05-28T06:07:15+00:00

<ListBox BorderThickness=0 x:Name=PendingChatListBox HorizontalContentAlignment=Stretch> <ListBox.ItemTemplate > <DataTemplate> <Button Height=40 Click=OpenChat_click Content={Binding BindsDirectlyToSource=True, Converter={StaticResource cPendingUnreadMessagesConverter}}

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<ListBox BorderThickness="0" x:Name="PendingChatListBox" HorizontalContentAlignment="Stretch">
    <ListBox.ItemTemplate >
        <DataTemplate>
            <Button Height="40" Click="OpenChat_click" Content="{Binding BindsDirectlyToSource=True, Converter={StaticResource cPendingUnreadMessagesConverter}}"  HorizontalContentAlignment="Center" Background="Transparent" x:Name="OpenChatButton" Foreground="Blue"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

ObservableCollection<SideBarUnit> OpenChats = new ObservableCollection<SideBarUnit>();
this.PendingChatListBox.ItemsSource = OpenChats;


if (PendingChatListBox.Items.Count > 0)
{
    // WHY IS THIS OBJECT NULL?
    object obj = PendingChatListBox.ItemContainerGenerator.ContainerFromItem(PendingChatListBox.Items[0]); 
}
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1 Answer

  1. Editorial Team

    Probably because of virtualization, items out of view have no container generated for them (if the items panel is virtualizing in nature; default for ListBoxes and the like).

    Or if you assign a source and try to get the container in the same method the ListBox did not have the time to create it yet. The UI-thread must idle to do so.

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