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LVM_SORTITEMS, you also need comparison procedure, that could just simply call lstrcmp.

Use LVM_SORTITEMSEX, it send the item indexes in the parameters so you can use it for the subitem number: (Code is thrown together pretty quickly so excuse the sloppiness)
SORDER is true or false (Ascending or Descending)

invoke SendMessage,LVHANDLE,LVM_SORTITEMSEX,SORDER,ADDR LVCompareFunc



LVCompareFunc proc lParam1:DWORD,lParam2:DWORD,lParamSort:DWORD

	LOCAL 	TBUFFER1[256]	:BYTE

	LOCAL 	TBUFFER2[256]	:BYTE

	LOCAL	ItemData		:LV_ITEM



	mov eax,lParam1

	mov ItemData.iItem,eax



	mov eax,LVSORTCOLUMN

	mov ItemData.iSubItem,eax



	lea eax,TBUFFER1

	mov ItemData.pszText,eax



	mov ItemData.cchTextMax,255

	mov ItemData.imask,LVIF_TEXT



	invoke SendMessage,LVHANDLE,LVM_GETITEM,0,ADDR ItemData



	mov eax,lParam2

	mov ItemData.iItem,eax



	mov eax,LVSORTCOLUMN

	mov ItemData.iSubItem,eax





	lea eax,TBUFFER2

	mov ItemData.pszText,eax



	mov ItemData.cchTextMax,255

	mov ItemData.imask,LVIF_TEXT



	invoke SendMessage,LVHANDLE,LVM_GETITEM,0,ADDR ItemData



	invoke lstrcmp,ADDR TBUFFER1,ADDR TBUFFER2



	.IF lParamSort == FALSE

		neg eax

	.ENDIF

	

	ret

LVCompareFunc endp

EDIT: cleaned it up a bit. BTW LVSORTCOLUMN
is the column number to be sorted.

Also to get the column number from a header click process the LVN_COLUMNCLICK notification:

.ELSEIF uMsg == WM_NOTIFY

	mov	edx, lParam

	.IF [edx].NMHDR.code == LVN_COLUMNCLICK

		push [edx].NM_LISTVIEW.iSubItem

		pop LVSORTCOLUMN

	.ENDIF



etc...

I don't think LVM_SORTITEMSEX is in Windows.inc, here it is just in case:

LVM_SORTITEMSEX equ LVM_FIRST + 81

This seems to be missing as well...

LVS_EX_BORDERSELECT equ 16384