Hi,
In CVI you define the "parent" of a window when you load the panel. If you need to change this state you would need to discard the panel and reload it as a chald panel. This method will confine the window to the parent windoe, but it will be a bit different than MDI.
You can use calls to the Windows API to confine the window and have a full MDI look of your applications. Here is a link to a good example that calls the Windows SDK to confine a window within another parent window:
Creating a Child Window Inside a LabWindows/CVI Top-level Panel to Simulate Multiple Document Interf...To run
this example you need to have the Windows SDK installed, just run the CVI installer from add/remove programms, select CVI, go to modify and make sure that Windows SDK is selected.
I hope this helps.
Regards,
Juan Carlos
N.I.