>this.BackColor = System.Drawing.Color.White; >One WOULD think that this would do it for you, but it doesn't...when you set a .NET Windows Form IsMdiContainer to true, it picks up background color from your Windows settings. To change the color, you need to change the BackgroundImage property to a bitmap that contains the color you want. For an example of this, check out the MM .NET sample application. The BackgroundImage property is set to "White.bmp".