List Box Differences

In a version 4.0 application, a list box that is part of a combo box uses the WM_CAPTURECHANGED notification message to hide its drop-down list if it is open. For more information, see "Combo Boxes" later in this topic.

The DDL_EXCLUSIVE flag of the DlgDirList function does not have the expected result in a version 3.x application. Specifically, the flag does not exclude read-write files from the list. In a version 4.0 application, the DDL_EXCLUSIVE flag excludes read-write files.

If a list box in a version 3.x application has either the WS_HSCROLL or WS_VSCROLL style, the list box receives both horizontal and vertical scroll bars. Although one of the scroll bars is typically hidden, Windows 95/98 displays the hidden scroll bar if its scrolling range becomes greater than zero. In a version 4.0 application, a list box does not receive a horizontal scroll bar, unless it has the WS_HSCROLL style. Likewise, it does not receive a vertical scroll bar unless it has the WS_VSCROLL style.

When creating a list box in a version 3.x application, Windows 95/98 always increases the size of the list box by adding the border width to each side. This is done because Windows 95/98 assumes that the dimensions specified by the application or the dialog template are for the client area of the list box. Unfortunately, increasing the size in this way makes aligning a list box rather difficult. Windows 95/98 does not increase the size when creating a list box in a version 4.0 application; Windows 95/98 assumes that the specified size includes the borders.