Determines the width of each item for the dialog element.

For image list controls, this attribute specifies the width of the images in the image file(s) providing the image list's images. If neither the "Large images (L)" nor the "Small images (S)" STYLE flags are set for the image list, this is also the width of the images stored in the image list control. If either either (or both) of these styles are specified, the ITEM-W attribute is usually left set to its default value of zero, implying the use of the the system-defined small and/or large icon width(s). For more information, please refer to the article Working with Image List Controls.

Applies to	Image list control, tab control, tool bar, tool bar control.
Data Type	I4
Default Value	0 (system default)
Possible Values	0 - 9999