Add code to a excel's form created by program (Vb .Net)

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How can I to add code to a Microsoft Excel's form created by program?
I try with :

VBCompForm = oExcel.ActiveWorkbook.VBProject.VBComponents.Add(VBIDE.
vbext_ComponentType.vbext_ct_MSForm)
VBCompForm.Name = "New_Frm"


Dim VBCodeMod_Frm As VBIDE.Components
Dim linea_frm As Long

VBCodeMod_frm = oBook.vbproject.vbcomponents("New_Frm").codemodule
With VBCodeMod_frm
linea_frm = .CountOfLines + 1
.InsertLines(linea_frm, _
"Private Sub UserForm_Activate()" & Chr(13) + Chr(13) & _
"'Boton Aceptar" & Chr(13) & _
"loCmd1 = Me.Controls.Add(""Forms.Commandbutton.1"", BtnOk, Visible)"
& Chr(13) & _
"With loCmd1" & Chr(13) & _
" .Left = 90" & Chr(13) & Chr(13) & _
" .Top = 125" & Chr(13) & _
" .Width = 50" & Chr(13) & _
" .Height = 20" & Chr(13) & _
" .Caption = ""Aceptar""" & Chr(13) & _
"End With" + Chr(13) + Chr(13) & _
....

but it does not work.