The list box control window procedure responds to this message by sending it to its owner if it has not processed the key stroke. This is the most common means by which the input focus is switched around the various controls in a dialog box.

The key strokes processed by a list box control are:

Down Arrow

Moves the selection down one item, scrolling the list box by one item, if necessary, to make the next item visible. When the selection reaches the bottom, the Down Arrow has no effect.
Up Arrow
Moves the selection up one item, scrolling the list box by one item, if necessary, to make the previous item visible. When the selection reaches the top, the Up Arrow has no effect .
Page Down
Moves the selection down one page, scrolling the list box by the number of items visible in the list box.

For example, if the list box displays seven items and item 1 is selected and positioned at the top of the list box, pressing the Page Down key causes item 8 to be selected and displayed at the top of the list box. Pressing Page Down when the last item is selected has no effect.

Page Up
Moves the selection up one page, scrolling the list box by the number of items visible in the list box.

For example, if the list box displays seven items and item 8 is selected and positioned at the top of the list box, pressing the Page Up key causes item 1 to be selected and displayed at the top of the list box. Pressing the Page Up key when the first item is selected has no effect.

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