Updating A List Box...

I have written some code that populates a list box with data, and have allowed data to be deleted from the list box if a line of data is double-clicked, with the data below the deleted row being updated to remove the empty row, etc. All works fine except that, when I force the list box's 'selected' line to be the one below the last entry (as if you were selecting the next empty line with the mouse) and the code completes, you cannot click on the form and move it around, nor can you access any other of the form's controls, until you click inside the list box.

Apparently, forcing the line selection in the list box (to simulate someone clicking on a row in the list box) is what's causing the problem. I need to force the selection because the number of data lines in the list box is more than can be shown in the list box, therefore I need a method to automatically scroll the list box to show the next available line in the list box.