This might be worth a try:
http://www.fontstuff.com/access/acctut11.htm
...select a block of items by clicking on the first one and
shift+clicking on the last one.
Separate non-adjacent items can be selected by clicking on the first one
then control+clicking on the others. Already selected items are
de-selected with control+click.
Also
http://www.eggheadcafe.com/software...problem-with-ctrl-and-akey-listbox-event.aspx
Joe posted on Sunday, October 07, 2007
There is a multiselect item in listboxes that can be set.
Indicates whether the object permits multiple selections.
Syntax
object.MultiSelect [= fmMultiSelect]
The MultiSelect property syntax has these parts:
Part Description
object Required. A valid object.
fmMultiSelect Optional. The selection mode that the control uses.
Settings
The settings for fmMultiSelect are:
Constant Value Description
fmMultiSelectSingle 0 Only one item can be selected (default).
fmMultiSelectMulti 1 Pressing the SPACEBAR or clicking selects or
deselects an item in the list.
fmMultiSelectExtended 2 Pressing SHIFT and clicking the mouse, or pressing
SHIFT and one of the arrow keys, extends the selection from the
previously selected item to the current item. Pressing CTRL and clicking
the mouse selects or deselects an item.
Remarks
When the MultiSelect property is set to Extended or Simple, you must use
the list box's Selected property to determine the selected items. Also,
the Value property of the control is always Null.
The ListIndex property returns the index of the row with the keyboard focus.
