Used ItemEvent and clicking on the tab we change the level of the open form with function below
Public Sub AlteraNivelAba(ByVal FormTypeEx As Integer, ByVal FormTypeCount As Integer, ByVal Nivel As Integer)
Dim oMktFormLocal As Form
Try
oMktFormLocal = SBO_Application.Forms.GetFormByTypeAndCount(FormTypeEx, FormTypeCount)
oMktFormLocal.PaneLevel = Nivel
Catch ex As Exception
SBO_Application.MessageBox("Ocorreu um erro ao alterar nível da aba FrontProduction. " & ex.Message)
End Try