ulArrangeType (ULONG)
Specify one of the following arrangement types:
CMA_ARRANGESTANDARD
Icons are arranged at the top of the window, starting at the upper left-hand corner. This value is set to zero to provide compatibility with existing applications.
Icons are arranged in a grid of equal-size squares in the container window. The grid pattern can be defined as the perimeter, left, right, top, or bottom of the window. It also can be user-defined.
Currently selected icons are arranged horizontally or vertically in the container window.