Use CtrlGetMultCurSel with Extended Selection List Box

The official InstallShield 2013 documentation states the following:

The CtrlGetMultCurSel function retrieves the currently selected lines from a multi-selection list box control, that is, a list box control with the LBS_MULTIPLESEL style. (This function does not support extended selection list box controls, that is, list box controls with the LBS_EXTENDEDSEL style.)

Turns out this is not entirely correct. If you set both list box styles (LBS_MULTIPLESEL and LBS_EXTENDEDSEL), then the list box has extended multi-selection style, but CtrlGetMultCurSel() works well with it.

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