How to make the reference of Combobox

Hello,

I have a function like this

Private Sub loadListBox(sCombo As ComboBox, tableName As String, idField As String, nameField As String)
' my codes are here
End Sub

while i tried to call this function  like this loadListBox cmbogenre, "tblgenre", "genre_id", "genre_name"

it gives me "Type mismatch error", may be the reference is made to VB's default combobox, not xtremesuites' combobox. How to make reference to Xtreme Suites's Combobox instead of Vb's default ComboBox ??

Thanks
watsmyname