double mdi form?

[markman]

Id like an mdi form with a child that has mdi children, sort of like an mdiform as an mdichild of another mdiform. Ill try and draw a pic:

________
| |------|   |
| | |--|  |   |
| | |_|  |   |
| |        |   |
|  -------|   |
|               |
-------------

Is that possible?