Binding 1000usercontrols to listbox is slow wpf - wpf

Question

I am having a listbox to which i am binding around 1000usercontrols with itemspaneltemplate as grid and i am placing each usercontrol by specifying rows and columns which is working fine.
But problem is it takes too much of time to load i even used backgroundworker process also but also no use.
Please help me what is the solution for the above problem.
<ListBox VerticalAlignment="Top" ItemsSource="{Binding Session.LstPlannedLightChkEntity,ElementName=uc, IsAsync=True}" Grid.Row="0"
VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.VirtualizationMode="Recycling"
local:DragDropHelper.IsDragSource="true" local:DragDropHelper.IsDropTarget="true"
local:DragDropHelper.DragDropTemplate="{StaticResource planetTemplateDrag}"
ScrollViewer.VerticalScrollBarVisibility="Hidden" ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ScrollViewer.CanContentScroll="True"
>
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="Grid.Row" Value="{Binding Row}"/>
<Setter Property="Grid.Column" Value="{Binding Column}"/>
<Setter Property="Grid.ColumnSpan" Value="{Binding ColumnSpan}" />
<Style.Resources>
<!-- Background of selected item when focussed -->
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Transparent"/>
<!-- Background of selected item when not focussed -->
<SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent" />
</Style.Resources>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<local:GridControl x:Name="gcMenuPlanned" VerticalAlignment="Stretch" Margin="-1,-1,0,0"
ShowCustomGridLines="True" GridLineBrush="#FFE4E7EB" GridLineThickness="0.5" SnapsToDevicePixels="True">
<local:GridControl.ContextMenu>
<ContextMenu >
<MenuItem Foreground="Black" Header="Add Task" Click="AddTask_Click" Tag="{Binding CheckType}" />
<MenuItem Foreground="Black" Header="Goto..." Click="miGoto_Click" Tag="{Binding CheckType}" />
</ContextMenu>
</local:GridControl.ContextMenu>
</local:GridControl>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<local:LightFCCheckBlockControl CheckColor="#FFA2CAEB" MouseLeftButtonDown="LightFCCheckBlockControl_MouseLeftButtonDown">
<local:LightFCCheckBlockControl.ContextMenu>
<ContextMenu >
<MenuItem Foreground="Black" Header="Edit" Click="miEdit_Click" Tag="{Binding CheckType}" Visibility="{Binding Path=OpacityForCCheck,Converter={StaticResource opacityToVisibility}}"/>
<MenuItem Foreground="Black" Style="{StaticResource MenuItemBindingStyle }" Click="miFreeze_Click" Tag="{Binding CheckType}" Visibility="{Binding Path=OpacityForCCheck,Converter={StaticResource opacityToVisibility}}">
</MenuItem>
<MenuItem Foreground="Black" Click="RemoveChecks_Click" Header="Remove Checks" Tag="{Binding CheckType}"/>
<MenuItem Foreground="Black" Click="DeleteChecks_Click" Header="Delete Checks" Tag="{Binding CheckType}" Visibility="{Binding Path=OpacityForCCheck,Converter={StaticResource opacityToVisibility}}"/>
<MenuItem Foreground="Black" Header="Goto..." Click="miGoto_Click" Tag="{Binding CheckType}" Visibility="{Binding Path=OpacityForCCheck,Converter={StaticResource opacityToVisibility}}"/>
</ContextMenu>
</local:LightFCCheckBlockControl.ContextMenu>
</local:LightFCCheckBlockControl>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Thanks
Yogaraj I

Answer 1

Well it sounds a bit odd. First of all, you should answer the question...Is it really necessary to bind 1000 items to a list, which should be shown in UI? The usability would not be the best. Perhaps you could choose an approach with deferred loading.
Second, did you disable the Virtualization in the ListBox? Usually, there are only rendered the visuals for the elements, which are visible. The controls will be reused in case of scrolling.