That is the Rack Mounted Equipment stencil.
The Edit -> Open "patch panel" is the right way to go. It does not ungroup
the shape, but it does open it up to examine the components.
My prefered way is to click on View -> Drawing Explorer Window. In the
Explorer Window click on Master to expand the folder and then right click on
the shape and chose Edit Master Shape. This will open a window similar to
the open "patch panel", but there will be a master explorer window on the
left. This gives you a better view of the component shapes and easier way to
select the different shapes.
In this case, the shape is made up of fourteen shapes. Four of the shapes
are used to group the other shapes. Each Visio shape can have one block of
text, one colour, one line format. So a multicoloured shape is based on
several shapes. This shape has a single shape for the white squares, but a
seperate geometry for each plug.
I'll continue hacking this shape apart and let you know what happens.
John... Visio MVP
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