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How to multi select items in WPF Treeview using Shift Button

Posted By:      Posted Date: October 01, 2010    Points: 0   Category :WPF

I have a requirement where i have to create a WPF Treeview, bind it to a dataset.
Then i have to provide functionality for user to select nodes either using Ctrl or multi select using Shift button.

I am able to write code to do all the tasks above except multi select using Shift button.
Following is my XAML for Treeview.

<TreeView Name="tvOutput" ItemsSource="{Binding}" Height="200" VerticalAlignment="Top" MouseMove="tvOutput_MouseMove" DragLeave="treeView_DragLeave" SelectedItemChanged="Tree_SelectedItemChanged">
                                <!-- This Style binds a TreeViewItem to a Node. -->
                                <Style TargetType="{x:Type TreeViewItem}">
                                    <Setter Property="IsEnabled" Value="{Binding IsEnabled, Mode=TwoWay}" />
                                    <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
                                        <Trigger Property="IsEnabled" Value="True">
                                            <Setter Prop

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