Make sure to assign the SmallIcon property for your ListItems.

For best visual results, make the font of your comboboxes and datepickers one point smaller than the listview font (in the example, the LV is Tahoma 9, and the combo and dtp are Tahoma 8).

For textboxes, BorderStyle = None is preferred.

Other issues involved in making this work smoothly should be evident by examining the code.