Help witht the TAB button

[ChimpFace9000]

What do i have to do to my code to make the focus change controls when you press tab? Here's my code...


.386
.model flat, stdcall
option casemap:none

include \masm32\include\windows.inc
include \masm32\include\kernel32.inc
includelib \masm32\lib\kernel32.lib
include \masm32\include\user32.inc
includelib \masm32\lib\user32.lib
include \masm32\include\gdi32.inc
includelib \masm32\lib\gdi32.lib

include \masm32\include\mac.inc

MainFunction proto

.data
MainWindowClass db "MainWindowClass", 0
StaticClass db "STATIC", 0
ButtonClass db "BUTTON", 0
MainWindowName db "Practice001.exe", 0
StaticOneName db "The colors is...", 0
ButtonOneName db "Red", 0
ButtonTwoName db "Green", 0

.data?
hAppInstance HINSTANCE ?
hMainWindow HWND ?
hStaticOne HWND ?
Colors COLORREF ?
BkColors COLORREF ?

.const
StaticOne equ 0
ButtonOne equ 1
ButtonTwo equ 2

.code
start:
invoke GetModuleHandle, NULL
mov hAppInstance, eax

invoke MainFunction

invoke ExitProcess, 0

MainFunction proc
local WndClassEx:WNDCLASSEX
local Msg:MSG

mov WndClassEx.cbSize, SIZEOF(WNDCLASSEX)
mov WndClassEx.style, CS_DBLCLKS
mov WndClassEx.lpfnWndProc, offset MainWindowProc
mov WndClassEx.cbClsExtra, NULL
mov WndClassEx.cbWndExtra, NULL
push hAppInstance
pop WndClassEx.hInstance
invoke LoadIcon, NULL, IDI_APPLICATION
mov WndClassEx.hIcon, eax
mov WndClassEx.hIconSm, eax
invoke LoadCursor, NULL, IDC_ARROW
mov WndClassEx.hCursor, eax
mov WndClassEx.hbrBackground, COLOR_WINDOW
mov WndClassEx.lpszMenuName, NULL
mov WndClassEx.lpszClassName, offset MainWindowClass

invoke RegisterClassEx, addr WndClassEx

invoke CreateWindowEx, NULL, addr MainWindowClass, addr MainWindowName, WS_OVERLAPPEDWINDOW, 200, 200, 300, 300, NULL, NULL, hAppInstance, NULL

mov hMainWindow, eax

invoke ShowWindow, hMainWindow, SW_SHOWDEFAULT
invoke UpdateWindow, hMainWindow

.while TRUE
invoke GetMessage, addr Msg, NULL, 0, 0
.BREAK .IF (!eax)
invoke TranslateMessage, addr Msg
invoke DispatchMessage, addr Msg
.endw

ret
MainFunction endp

MainWindowProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM

.if uMsg == WM_DESTROY
invoke PostQuitMessage, 0

.elseif uMsg == WM_CLOSE
invoke DestroyWindow, hWnd

.elseif uMsg == WM_CREATE
mov Colors, 000000h
mov BkColors, 0c0c0c0h

invoke CreateWindowEx, NULL, addr StaticClass, addr StaticOneName, WS_CHILD or WS_VISIBLE, 0, 0, 100, 20, hWnd, StaticOne, hAppInstance, 0
mov hStaticOne, eax

invoke CreateWindowEx, NULL, addr ButtonClass, addr ButtonOneName, WS_CHILD or WS_VISIBLE, 0, 21, 60, 35, hWnd, ButtonOne, hAppInstance, 0

invoke CreateWindowEx, NULL, addr ButtonClass, addr ButtonTwoName, WS_CHILD or WS_VISIBLE, 63, 21, 93, 35, hWnd, ButtonTwo, hAppInstance, 0

.elseif uMsg == WM_COMMAND
LOWORD wParam
.if eax == ButtonOne
mov Colors, 0000ffh
invoke InvalidateRect, hStaticOne, NULL, TRUE

.elseif eax == ButtonTwo
mov Colors, 000ff00h
invoke InvalidateRect, hStaticOne, NULL, TRUE

.endif

.elseif uMsg == WM_CTLCOLORSTATIC
invoke GetDlgCtrlID, lParam
.if eax == StaticOne
invoke SetBkColor, wParam, BkColors
invoke SetTextColor, wParam, Colors
invoke CreateSolidBrush, BkColors
ret
.endif

.else
invoke DefWindowProc, hWnd, uMsg, wParam, lParam

.endif

ret
MainWindowProc endp

end start