Actually, you need to hold the Shift key to select multiple controls by
clicking them with the mouse (or in some cases you can place the cursor
outside of the controls, then hold down the left mouse button while dragging
across the controls you want to select). You can also select a group of
controls by dragging or by selecting all, then holding the Shift key while
clicking in order to unselect certain controls. This technique can be handy
if you need to move all but a few controls.