Wpf TreeViewItem ContextMenu

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C#

VB

Silverlight

hi,
I have a query related to treeviewitem ContextMenu. I showed Files and folders in
treeview.Now I want to show different contextmenu for Files and Folders type treeviewitem. I added context menu item on ContextMenu_Opend event based on item type.
But if the previous treeviewitem is selected and I rightclick on other treeviewitem
then it shows contextmenu of previous file type. Here is my code--

private void ctxTreeviewMenu_Opened(object sender, RoutedEventArgs e)
        {

            FolderItem fitem = new FolderItem();                 
            fitem = (FolderItem)fileFolderTreeView.SelectedItem;
            if (fitem==null)
            {
                ctxTreeviewMenu.Items.Clear();
                return;
            }
            if (fitem.ItemType == FolderItemType.Folder)
            {
                ctxTreeviewMenu.Items.Clear();
                RadMenuItem radMenuItem1 = new RadMenuItem();
                radMenuItem1.Header = "New Document";
                ctxTreeviewMenu.Items.Add(radMenuItem1);
                RadMenuItem radMenuItem2 = new RadMenuItem();
                radMenuItem2.Header = "Edit";
                ctxTreeviewMenu.Items.Add(radMenuItem2);
                RadMenuItem radMenuItem3 = new RadMenuItem();
                radMenuItem3.Header = "New Folder";
                ctxTreeviewMenu.Items.Add(radMenuItem3);
                RadMenuItem radMenuItem4 = new RadMenuItem();
                radMenuItem4.Header = "Rename";
                ctxTreeviewMenu.Items.Add(radMenuItem4);
                RadMenuItem radMenuItem5 = new RadMenuItem();
                radMenuItem5.Header = "Delete";
                ctxTreeviewMenu.Items.Add(radMenuItem5);
                RadMenuItem radMenuItem6 = new RadMenuItem();
                radMenuItem6.Header = "Refresh";
                ctxTreeviewMenu.Items.Add(radMenuItem6);
                RadMenuItem radMenuItem7 = new RadMenuItem();
                radMenuItem7.Header = "Properties";
                ctxTreeviewMenu.Items.Add(radMenuItem7);
            }
            else
            {
                ctxTreeviewMenu.Items.Clear();
                RadMenuItem radMenuItem1 = new RadMenuItem();
                radMenuItem1.Header = "Open";
                ctxTreeviewMenu.Items.Add(radMenuItem1);
                RadMenuItem radMenuItem2 = new RadMenuItem();
                radMenuItem2.Header = "Edit";
                ctxTreeviewMenu.Items.Add(radMenuItem2);
                RadMenuItem radMenuItem3 = new RadMenuItem();
                radMenuItem3.Header = "Rename";
                ctxTreeviewMenu.Items.Add(radMenuItem3);
                RadMenuItem radMenuItem4 = new RadMenuItem();
                radMenuItem4.Header = "Delete";
                ctxTreeviewMenu.Items.Add(radMenuItem4);
                RadMenuItem radMenuItem5 = new RadMenuItem();
                radMenuItem5.Header = "Refresh";
                ctxTreeviewMenu.Items.Add(radMenuItem5);
                RadMenuItem radMenuItem6 = new RadMenuItem();
                radMenuItem6.Header = "Properties";
                ctxTreeviewMenu.Items.Add(radMenuItem6);
            }
           
        }   

and this is my Xaml file--

<grid>
                            <grid.rowdefinitions>
                                <rowdefinition height="*" />
                                <rowdefinition height="200" />
                            </grid.rowdefinitions>
                            <telerik:radtreeview grid.row="0" x:name="fileFolderTreeView" itemtemplate="{StaticResource FolderTemplate}" xmlns:x="#unknown" xmlns:telerik="#unknown">
                            IsLoadOnDemandEnabled="True" LoadOnDemand="fileFolderTreeView_LoadOnDemand" IsRootLinesEnabled="True" SelectionChanged="fileFolderTreeView_SelectionChanged" MouseRightButtonUp="fileFolderTreeView_MouseRightButtonUp">
                                <telerik:radcontextmenu.contextmenu>
                                    <telerik:radcontextmenu x:name="ctxTreeviewMenu" opened="ctxTreeviewMenu_Opened">
                                    </telerik:radcontextmenu>
                                </telerik:radcontextmenu.contextmenu>
                            </telerik:radtreeview>

                            <telerik:radtabcontrol grid.row="1" xmlns:telerik="#unknown">
                                <telerik:radtabitem header="Search">

                                </telerik:radtabitem>
                            </telerik:radtabcontrol>
                        </grid>