Form Background Image

Tabbed MDI uses a property off the DockRenderer that is in use. Many of the DockRenderer implementations have a TabbedMdiRootContainerBackgroundFill property. You can set that to an ImageBackgroundFill to achieve this.

Thank you for the quick reply.
Can you explain how to find TabbedMdiRootContainerBackgroundFill property?
I can not find the right way.

this.dockManager.DockRenderer is IDockRenderer type
IDockRenderer doesn't have a TabbedMdiRootContainerBackgroundFill property.

Do I have to cast?
I don't know what concrete Renderer I have because in InitializeComponent I only have:
this.uiRendererManager1.ColorSchemeType = WindowsColorSchemeType.WindowsClassic;
(now...maybe that will change in future)

It's uiRendererManager who does all the work of creating the Renderers, I can access only the interface.

Is there a way to know what Renderer I have in dockManager.DockRenderer?

The resolved renderer is always in DockManager.DockRendererResolved. If you have a DockManager.DockRenderer set, it returns that. Otherwise, it returns the global renderer.

The default global renderer will either be VisualStudio2005DockRenderer or Office2003DockRenderer depending on the ColorSchemeType type you chose. I think in your case it will be VisualStudio2005DockRenderer.

So yes, you will want to cast it. You can always do a type check to see what is in the DockRendererResolved property and change your cast based on that.

Thanks, it works!