To select multiple controls, perform one of the following actions
Drag out a selection rectangle on the form.
Any control that intersects the sizing rectangle is then selected.
Click on each control to be selected, while holding down the SHIFT key.
The sizing handles are drawn only on the last control that you selected.
To deselect a control that is already selected
While holding down the SHIFT key, click on the control that you do not require in the selection.
You can select a number of controls by dragging out a selection rectangle if you perform the mouse down part of the drag operation over a vacant area of the form. (Starting the drag operation over a control is interpreted as a movement of the control.)
When dragging out a rectangle:
Pressing the CTRL+SHIFT keys and then dragging the rectangle allows selection even if the start of the drag operation is over a control.
If the control move lock operation is on (that is, you selected the Lock Control Positions command from the Options menu or clicked the Control move lock padlock toolbar button), the drag selection can start over a control, as the controls cannot be shifted.