VB Migration Partner

KNOWLEDGE BASE - Forms and controls

Previous | Index | Next 

[PRB] Scrollbars in MDI forms are always visible

The Scrollbars property is only partially implemented in MDI forms, because setting this property to False doesn’t ensure that the scrollbars are really hidden.

In general, we recommend to set the Scrollbars property to True in MDI forms (its default value), because this is consistent with the behavior of all major MDI applications. If for any reason it is necessary to hide the scrollbars, you can use the following workaround

        Protected Overrides Sub WndProc(ByRef m As Message)
            If Not Me.ScrollBars AndAlso _
                  MyBase.MdiClientWindow IsNot Nothing AndAlso _
                  MyBase.MdiClientWindow.IsHandleCreated Then
                ShowScrollBar(MyBase.MdiClientWindow.Handle, 3, 0)
            End If
        End Sub 

Notice that the workaround isn’t perfect, because the scrollbar can become visible for an instant when an MDI child form is moved inside the MDI container.

The MdiClientWindow property (defined in the VB6MdiForm base class) returns the MdiClient object that corresponds to the inner area of an MDI form (it corresponds to the dark gray area). We decided to mark this property as protected and make it available to inherited classes to allow developers to be in full control of an MDI form.

Previous | Index | Next 

Follow Francesco Balena on VB6 migration’s group on


Read Microsoft Corp’s official case study of a VB6 conversion using VB Migration Partner.

Code Architects and its partners offers remote and onsite migration services.

More details

Subscribe to our free newsletter for useful VB6 migration tips and techniques.


To learn more about your VB6 applications, run VB6 Analyzer on your source code and send us the generated text file. You will receive a detailed report about your VB6 applications and how VB Migration Partner can help you to quickly and effectively migrate it to .NET.

Get free advice

A fully-working, time-limited Trial Edition of VB Migration Partner allows you to test it against your actual code

Get the Trial

The price of VB Migration Partner depends on the size of the VB6 application, the type of license, and other factors

Request a quote

Migrating a VB6 application in 10 easy steps

Comparing VB Migration Partner with Upgrade Wizard

Migration tools: Feature Comparison Table

All whitepapers