In layout mode, click the tabl control and select "Lock" in the Arrange menu or on the inspector's position tab.
Now you can drag selection boxes over/around objects in the tab control and move them without the tab control moving too.
Hold down the control key when dragging if you want to select only those objects on the layout that are fully enclosed in the selection rectangle.
Works perfectly, of course.
You're amazing as always.
Thanks very much.