I have a form with a multi select list box. When the form is launched, I have some code that automatically selects some of the items in the list box. The user then may alter the selections.

This is not working well. The initial selections from my code are displayed properly, but when the user CTRL-Clicks on any item, all of the items initially selected, from my code, are de-selected.

The list box is set to multi-select, as the user can continue CTRL-Clicking on other items, keeping the previous items selected by clicking.

How do I keep the items my code selects and allow the user to additionally select other items?