ref fragments in seq diagrams: display mode ?

[cty]

Hi,

when drag&dropping any diagram (diag1) into any other diagram(diag 2), you can select the "diagram frame" option and then vizualize this first diagram(diag1) completely (as if you have opened the diagram itself).
But... this does not work for "ref" frames when drag&dropping sequence diagrams into other sequence diagrams.

Is there any possibility to display this "ref" frame as described above (a "diagram frame")? Any "display mode" available somewhere ?

Thanks in advance for your help

Ronan