[RESOLVED] WinForms BeginUpdate() equivalent in WPF?

[Lith]

Ok, Wow, stupid me....

What you confirmed is entirely correct, what I forgot to do is to test the whole thing out in a new project in WPF without using a theme... And yeah, I just tried it... and yup, 100 000 items get added to the list in less than 3 seconds without a theme.

As I mentioned in my first post; I use the Expression Light theme from http://wpf.codeplex.com/wikipage?title=WPF%20Themes

Now, this means that the problem apparently lies in the theme....





OK, problem solved....
Apparently this was the wrong-doer in the Theme:

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListBox}">
                    <Grid>
                        <Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2" Background="{DynamicResource ControlBackgroundBrush}" />
                        <ScrollViewer Margin="1" Style="{DynamicResource NuclearScrollViewer}" Focusable="false" Background="{x:Null}">
                            <StackPanel Margin="1,1,1,1" IsItemsHost="true" />
                        </ScrollViewer>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Background" Value="{DynamicResource DisabledBackgroundBrush}" TargetName="Border" />
                            <Setter Property="BorderBrush" Value="{DynamicResource DisabledBorderBrush}" TargetName="Border" />
                        </Trigger>
                        <Trigger Property="IsGrouping" Value="true">
                            <Setter Property="ScrollViewer.CanContentScroll" Value="false" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>

I removed that part of the XAML script and now everything works like a charm.

Thank you VERY MUCH, I freakin' love you =D. No, but seriously, thanks for the help and confirming everything, really appreciate the help you've given me here =).