Selects or deselects a combo box or single-selection list box entry.
If the listbox is multiselect using -1 as the index value selects all items, while
using any other invalid index value deselects all items. For normal listbox, using -1
always deselects all items.
Namespace: PPJ.Runtime.WindowsAssembly: PPJ.Runtime.2 (in PPJ.Runtime.2.dll) Version: 2.0.1044.0 (2.0.1044.5276)