VB Migration Partner

KNOWLEDGE BASE - Forms and controls

Previous | Index | Next 

[HOWTO] Reduce flickering when loading or resizing a form with many controls

By default, .NET forms refresh the background each time a new control becomes visible. If the form has many controls and a background picture, this mechanism creates a lot of flickering. This happens with both native and migrated forms.

If you are working with a native .NET form you can remarkably reduce the flickering by adding the following code to your form:

        Protected Overrides ReadOnly Property CreateParams() As CreateParams
                Dim params As CreateParams = MyBase.CreateParams
                params.ExStyle = params.ExStyle Or &H2000000
                Return params
            End Get
        End Property

For extra ease of our users, we have added this feature to our VB6Form class. If you experience a lot of flickering when loading a form, all you need to do is setting the VB6Config.UseExCompositeStyle property to True when your app starts its execution:

        Sub Main()
            VB6Config.UseExCompositeStyle = True
        End Sub

If your project doesn’t have a Sub Main, you should insert the statement in the startup form’s static constructor:

        Shared Sub New()
            VB6Config.UseExCompositeStyle = True
        End  Sub 
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