В данном примере вам понадобятся следующие элементы: ComboBox, TextBox, Label, CommandButton. В ComboBox программа добавляет так называемые шаблоны, Label отображает текущее состояние выполнения кода, в TextBox'е содержится непосредственно текст, являющийся кодом программы, ну а CommandButton... и так понятно.
Как ни жаль, но всех возможностей функции EbExecuteLine я не знаю. Как говорится, вам и карты в руки.
Чуть не забыл. Вам понадобится дополнительный модуль в вашей программе. 
 
'КОД МОДУЛЯ
        
        Public Function secret() As String
        secret = "this is a secret subroutine"
        End Function
        Public Sub secret2()
        MsgBox "this is a secret subroutine 2"
        End Sub
        
        'КОД ФОРМЫ
        
        Option Compare Text
        Option Explicit
        
        Private Declare Function EbExecuteLine Lib "vba6.dll" (ByVal pStringToExec As         Long, ByVal Foo1 As Long, ByVal Foo2 As Long, ByVal fCheckOnly As Long) As Long
        
        ' For VB5 IDE
        'Declare Function EbExecuteLine Lib "vba5.dll" (ByVal pStringToExec As Long,         ByVal Foo1 As Long, ByVal Foo2 As Long, ByVal fCheckOnly As Long) As Long
        
        ' FOR Access 97/VBE.dll clients like Word 97 and Excel 97
        'Declare Function EbExecuteLine Lib "vba332.dll" (ByVal pStringToExec As Long,         ByVal Foo1 As Long, ByVal Foo2 As Long, ByVal fCheckOnly As Long) As Long
        
        Function FExecuteCode(stCode As String, Optional fCheckOnly As Boolean) As Boolean
        FExecuteCode = EbExecuteLine(StrPtr(stCode), 0&, 0&, Abs(fCheckOnly)) = 0
        End Function
        
        Private Sub Combo1_Click()
        Text1.Text = Combo1.List(Combo1.ListIndex)
        End Sub
        
        Private Sub Command1_Click()
        

im res As Boolean
        res = FExecuteCode(Text1.Text)
        Label1.Caption = "Status = " & res
        End Sub
        
        Private Sub Form_Load()
        Combo1.AddItem "?secret"
        Combo1.AddItem "msgbox secret"
        Combo1.AddItem "secret2"
        Combo1.AddItem "For x=0 to 5:?" & Chr$(34) & "hello " &         Chr$(34) & "&x:next:beep"
        Combo1.AddItem "sendkeys " & Chr$(34) & "{TAB}" & Chr$(34)         & ":sendkeys " & Chr$(34) & "{up}" & Chr$(34)
        Combo1.AddItem "shell " & Chr$(34) & "calc.exe" & Chr$(34)         & ",vbNormalFocus"
        Combo1.AddItem "shell " & Chr$(34) & "c:\windows\explorer.exe ::{20D04FE0-3AEA-1069-A2D8-08002B30309D}" & Chr$(34) &         ",vbNormalFocus"
        Combo1.AddItem "form1.text1.visible=false"
        Combo1.AddItem "form1.text1.visible=true"
        Combo1.AddItem "form1.combo1.listindex=1"
        Combo1.AddItem "msgbox app.Title"
        Combo1.AddItem "form1.combo1.listindex=1:form1.command1.valu e=true"
        Combo1.ListIndex = 0
        Show
        End Sub