Expnader View Crashing in WP8

Question

Hi,


I have created an expander view in my app.I have around 5k subitems for a header.The app gets crashed when the header is expanded.To just verify this, I have tried to display 500 subitems,it worked but took time to get expanded.Kindly help me if I can display 5K records with the help of expander view without taking time.My code is:

<Grid Margin="0,115,0,83"  >

                <ListBox x:Name="orderList" Margin="0,5,0,5"  >

                    <ListBox.ItemContainerStyle>

                        <Style TargetType="ListBoxItem">

                            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>

                        </Style>

                    </ListBox.ItemContainerStyle>

                    <ListBox.ItemsPanel>

                        <ItemsPanelTemplate>

                            <StackPanel/>

                        </ItemsPanelTemplate>

                    </ListBox.ItemsPanel>

                    <ListBox.ItemTemplate>

                        <DataTemplate>

                            <Grid>

                <toolkit:ExpanderView  Header="{Binding}"   Expander="{Binding}" ItemsSource="{Binding itemList}"  NonExpandableHeader="{Binding}" 

                IsNonExpandable="{Binding HasNoOptions}" IsExpanded="{Binding IsExpanded, Mode=TwoWay}" HeaderTemplate="{StaticResource CustomHeaderTemplate}" ExpanderTemplate="{StaticResource CustomExpanderTemplate}" 

                ItemTemplate="{StaticResource CustomItemTemplate}" NonExpandableHeaderTemplate="{StaticResource CustomNonExpandableHeaderTemplate}" Style="{StaticResource ExpanderViewStyle1}" />

                          </Grid>

                        </DataTemplate>

                    </ListBox.ItemTemplate>

                </ListBox>

            </Grid>


 this.orderList.ItemsSource = myList;