Problem:

In my Drawing Model I opened the Reference Dialog and selected the Design model referenced in. I right clicked and selected Exchange. Now my Design Model only displays the contents of that Named Boundary and the rest of my Design appears to have disappeared. How do I get it back?

Answer:

1. Go to the Design Model.
2. Do a right click and hold. Go to Clip Volume > Clear Active Clip Element. Data Point in the View Window. 
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