Display Ports Dynamically in JointJs

Is it possible to show ports programmatically in JoinJS? This is what I want to do.

• Using RappidJs.
• Would like to not show ports in Stencil.
• Show the ports after dropping cell on paper.

I see API for addPort and removePort but don't see anything around hide / display.

Please try setting the port opacity attribute to show ports only after dropping to paper.

        attrs: {
                '.port-body': {
                    opacity: 1 // or 0
                }