Selecting Multiple ListBox items

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Silverlight

Hi All,

I am using the ExtendedListBox in which i am showing the document images. I have provided the code below.

<local:ExtendedListBox x:Name="lstSourceDocumentThumbs" Style="{StaticResource draggableListBox}" Background="White"
ItemsSource="{Binding Path=PageThumbsList, Mode=TwoWay}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled" ClickOnSelectedItemAction="KeepSelectionIfItemSelected" MouseLeftButtonUp="MouseButtonUp"
ScrollViewer.VerticalScrollBarVisibility="Auto" SelectionMode="Extended"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0"
ItemTemplate="{StaticResource tplDistributePageThumb}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<telerik:RadWrapPanel>
</telerik:RadWrapPanel>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</local:ExtendedListBox>


When I select multiple document and then click on any one of them then that document get deselected while the other remain selected. But i want that the document which i click should get selected while other get deselected. I can achieve this by using
ClickOnSelectedItemAction="OverrideSelection"
But the problem with this when i go for drag and drop only the document on which i selcted while dragging gets dragged. I want that if i select multiple document and goes for dragging then all these document gets dragged and when i select multiple document and just click any of the document only that document remain selectd.

Please help me how can i acheive this?

Thanks,
Umesh Tayade