Something

	mov ecx, 13


	push esi	;Pushes ESI Value which is FFFFFFFF because it hasnt been used.
	xor esi, esi	;XOR ESI, ESI  :  Zeros ESI



label1:
	mov edx, 13000
	add edx, ecx
	mov temp, edx
	push ecx



	push esi	;Pushes ESIs value which is ZERO



	invoke CreateWindowEx, NULL, ADDR ChildClassName, NULL,\
		WS_CHILDWINDOW + WS_VISIBLE,\
		CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,\
		hwnd, [temp], hInstance, NULL


	pop esi		;POPs ESI, noting ESI value has not been changed from above func, ESI = 0


	mov [ChildIDsArray+esi], eax




	add esi, 4	; Adds 4 to ESI.. ?? why, this is in your LOOP and is poped 2 lines down



	pop ecx
	loop label1



	pop esi		; ESI is POPed thus leaving us with an ESI value of FFFFFFFF... restores esi to unused state.