How to set border (stroke) to a placeholder

Hi.

I am trying to set a border (stroke) into a placeholder but I can´t and I don´t find anything that helps inside the Api Reference or samples.
Till now I only could set a backgroud, but i need a way to wrap the placeholder into something with border.
This is the node that i am trying to create

The problem is that I don´t want anymore the orange background, instead, i want only a border.

The structure that i have is:

Group - LayeredDigraph
    Shape - Rectangle That wraps all the node
    Vertical Panel
        Text (Text at the top)
        PlaceHolder
        Text (Text at the bottom)
    TreeExpanderButton 
    Asterisk Button

The internal nodes with the image are placed inside the placeholder
Thanks.

I suggest that you remove the existing Shape in your Group template. I assume your Group’s panel type is “Spot”, so that you can position the two buttons.

And then replace the Placeholder with an “Auto” Panel consisting of a Shape surrounding the Placeholder. Set the Shape.fill to null or “transparent”.

Spot Group
    Vertical Panel
        Text (Text at the top)
        Auto Panel
            Shape (no-fill Rectangle that wraps the Placeholder)
            PlaceHolder
        Text (Text at the bottom)
    TreeExpanderButton (alignment: Spot.Right)
    Asterisk Button (alignment: Spot.Left)

http://gojs.net/latest/intro/shapes.html
http://gojs.net/latest/intro/groups.html