i have a code which adds sheet names to combo box

Dim ctrl As CommandBarControl
Dim wks

Set ctrl = Application.CommandBars("myNavigator") _
.FindControl(Tag:="__wksnames__")
ctrl.Clear

For Each wks In ActiveWorkbook.Sheets
'If wks.Visible = xlSheetVisible Then
ctrl.AddItem wks.Name
'End If
Next wks
End Sub

i need a code which deletes the selected sheet from combo box... the
following code is throwing me an error .........

Set ctrl = .Controls.Add(Type:=msoControlButton, temporary:=True)
With ctrl
.Style = msoButtonCaption
.Caption = "Delete Sheets"
.OnAction = "'" & ThisWorkbook.Name & "'!DeleteSheets"
End With
End With

Sub DeleteSheets()
Dim myWksName As String
Dim wks

With Application.CommandBars.ActionControl
If .ListIndex = 0 Then
MsgBox "Please select an existing sheet"
Exit Sub
Else

.Delete .List(.ListIndex)
End If
End With

Set wks = Nothing
On Error Resume Next
On Error GoTo 0

If wks Is Nothing Then
Call RefreshTheSheets
MsgBox "Please try again"
Else
wks.Select
End If

End Sub