Hi MANS13,
In Blend 2015, we create DataTemplate for a control through following steps.
- Right-click the ListBox control in Blend.
- Choose "Edit Additional Templates".
- Choose "Edit Generated Items (ItemTemplate)".
- Choose "Create Empty".
- It will pop up a Create DataTemplate Resource window to let us add DataTemplate for the ListBox.

Best Regards,
Weiwei
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