You create a Windows client application by using Windows Presentation Foundation (WPF). 
The application contains the following code fragment. 

You need to assign lbDetails to use the detail data template when btnDetails is clicked. 
Which code segment should you write for the click event handler for btnDetails?（）

A. lbDetails.ItemsPanel.FindName("detail",lbDetails);
B. var tmpl = (ControlTemplate)FindResource("detail"); lbDetails.Template = tmpl; 
C. var tmpl = (DataTemplate)FindName("detail"); lbDetails.ItemTemplate = tmpl;
D. var tmpl = (DataTemplate)FindResource("detail"); lbDetails.ItemTemplate=tmpl;