why dose VBA not call my lisp command?

[looseLISPSsinkSHIPS]

Hi,

I have created a lisp named FLAT.lsp and loaded it with in AutoCAD 2010 I then tested it by typing its command in the command prompt with the result being positive.

I have now scripted a VBA program that is as follows:

Private Sub CommandButton1_Click()
If CheckBox1 Then
ThisDrawing.SendCommand ("(Command ""Flat"")" & vbCr)
End If
Unload UserForm1
End Sub

Private Sub UserForm_Click()

End Sub

Even though the lisp is loaded and its command is working if typed manually, auto cad dose not respond to my call for the function, stating the following at the command prompt:

Command: (Command "Flat")
Flat Unknown command "FLAT". Press F1 for help.

How can this be, its calling the exact same command name as what I would type in manually???

Could anybody tell me where my error is I have tried my VBA program with an existing AutoCAD command as follows (which seams to work fine) yet I don’t see the difference?

Private Sub CommandButton1_Click()
If CheckBox1 Then
ThisDrawing.SendCommand ("(Command ""LINE"")" & vbCr)
End If
Unload UserForm1
End Sub

Private Sub UserForm_Click()

End Sub

Thanks-

I belive I had this b4 a few years ago, sothing to do with creating a module in VBA (cant be for sure now)...

[rkmcswain]

Even though the lisp is loaded and its command is working if typed manually, auto cad dose not respond to my call for the function, stating the following at the command prompt:

Command: (Command "Flat")
Flat Unknown command "FLAT". Press F1 for help.

How can this be, its calling the exact same command name as what I would type in manually???

Because it's not an internally defined command.
Try (c:flat) at the command prompt.