For list boxes, look at the Properties tab for the control, and you should
see a MultiSelect property. The default is None, but you can change that to
Simple (which means that multiple items can be selected or deselected by
clicking them with the mouse or pressing the SPACEBAR.) or Extended (which
means multiple items can be selected by holding down SHIFT and clicking them
with the mouse or by holding down SHIFT and pressing an arrow key to extend
the selection from the previously selected item to the current item. You can
also select items by dragging with the mouse. Holding down CTRL and clicking
an item selects or deselects that item.)
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