显示 Combo 的下拉条
声明：
Public Declare Function SendMessageLong Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Const CB_SHOWDROPDOWN = &H14F
使用：
'程序控制显示下拉条
r = SendMessageLong(Combo1.hWnd, CB_SHOWDROPDOWN, True, 0)
'程序控制隐藏下拉条
r = SendMessageLong(Combo1.hWnd, CB_SHOWDROPDOWN, False, 0)
确定 TextBox 有几行
声明：
Public Declare Function SendMessageLong Lib _ "user32" Alias "SendMessageA" (ByVal hwnd As Long, _ ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Const EM_GETLINECOUNT = &HBA
使用：
lineCount = SendMessageLong(Text1.hwnd, EM_GETLINECOUNT, 0&, 0&)
TextBox 中英文输入方法切换 98-7-22
IMEMode 属性可以方便地控制输入方法：
Text1.IMEMode = 0 '初始值
Text1.IMEMode = 1 '中文输入
Text1.IMEMode = 2 '英文输入
Text1.IMEMode = 3 '禁止中文输入
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