Hi,

I'm facing a performance issue with a crowded combobox (5000 items). Rendering of the drop down list is really slow (as if it was computing all items before showing any).

Do you have any trick to make this dropdown display lazy?

Xaml code:

  <Grid x:Name="LayoutRoot">
        <StackPanel Orientation="Horizontal" Width="200" Height="20">
            <TextBlock>Test Combo </TextBlock>
            <ComboBox x:Name="fooCombo" Margin="5,0,0,0"></ComboBox>
        </StackPanel>
    </Grid>

code behind:

public MainPage() { InitializeComponent();

    List<string> li = new List<string>();

    int Max = 5000;
    for (int i = 0; i < Max; ++i)
        li.Add("Item - " + i);

    fooCombo.ItemsSource = li;
}