public Control Control { get; set; }

Public Property Control As Control

if (e.Document == xtraUserControl3Document)
    e.Control = new CustomDocumentApplication.XtraUserControl3();
if (e.Document == xtraUserControl2Document)

case 0:
    e.Control = new DocumentViewerUserControl() { Report = new ManagementReport() };
    break;

docs.Add(e.Document);
    e.Control = wb;
}

private void tabbedView1_QueryControl(object sender, DevExpress.XtraBars.Docking2010.Views.QueryControlEventArgs e) {
    e.Control = new Control();
}

If e.Document Is xtraUserControl3Document Then
    e.Control = New CustomDocumentApplication.XtraUserControl3()
End If

Case 0
    e.Control = New DocumentViewerUserControl() With {.Report = New ManagementReport()}
Case 1

docs.Add(e.Document)
    e.Control = wb
End Sub

Private Sub tabbedView1_QueryControl(ByVal sender As Object, ByVal e As DevExpress.XtraBars.Docking2010.Views.QueryControlEventArgs)
    e.Control = New Control()
End Sub