Undocking and moving the B744 Overhead and other 2D panels .

I find that I can undock and move the B744 overhead 2D panel to a separate monitor without first checking the PMDG pull-down menu item, so I'm not sure what all that means? Can someone enlighten me as to what the issues are with the overhead being undocked and moved, and what that pull-down menu item actually does ? Also-I don't see a pull-down menu item for the radio or throttle panels, and wonder if they are moveable at all (although I seem to be able to move them OK by undocking, to a separate monitor???).Thanks.Bruce.