To make a subVI's panel visible when you call it, select VI Properties from the file menu or right clicking on the VI's icon. You then want to choose the Window Appearance category and click the Customize button. On the Customize Window Appearance screen, select Show Panel When Called and Close Afterwards if Originally Closed. This assumes that you're not calling the VIs dynamically with VI Server. If you are, then you use the property Front Panel Window.Open