怎么在数据窗口中用左箭头实现shift+tab

问：各位大侠： 我想在PB中获得一个象foxpro那样的编辑环境，即按左箭头光标便移动到当前列的左边一列，按右箭头光标便移动到右边一列，请问有什么办法？特急！！！

答：声明函数：
subroutine keybd_event(uint bVk,uint bScan,long dwFlags,long dwExtraInfo ) library 'user32.dll'

定义用户事件keydown：pbm_dwnkey。
在事件中编程：

integer VK_TAB = 09
integer VK_SHIFT = 16

if key = KeyLeftArrow! then
    keybd_event(VK_SHIFT,0,0,0) //按下shift
    keybd_event(VK_TAB,0,0,0) //按下tab
    keybd_event(VK_TAB,0,2,0) //释放tab
    keybd_event(VK_SHIFT,0,2,0) //释放shift
    return 1
end if

if key = KeyRightArrow! then
    keybd_event(VK_TAB,0,0,0) //按下tab
    keybd_event(VK_TAB,0,2,0) //释放tab
    return 1
end if

function boolean GetKeyboardState (ref char kbarray[256]) library "user32.dll"
function boolean SetKeyboardState (ref char kbarray[256]) library "user32.dll"
//脚本：用户事件keydown：pbm_dwnkey
char lc_kb[256]
if key = KeyLeftArrow! then
    GetKeyboardState (lc_kb)
    lc_kb[17] = Char (128)
    SetKeyboardState (lc_kb)
    Send (Handle (this), 256, 9, 0)
    GetKeyboardState (lc_kb)
    lc_kb[17] = Char (0)
    SetKeyboardState (lc_kb)
end if