TBM_SETPAGESIZE  A8C5WK 

The TBM_SETPAGESIZE message sets the size of the page for a trackbar. The page size affects how much the slider moves for the TB_PAGEUP and TB_PAGEDOWN notification messages.

TBM_SETPAGESIZE
wParam = 0;

lParam = (LONG) lPageSize;

Parameters

lPageSize

New page size.

Return Values

Returns a 32-bit value that specifies the previous page size.