How do I set a Windows Forms Title Bar and UI use the flat OS theme of Windows 8/10, not XP/7 textured look?

Question

I am updating a Visual Basic Windows Forms application that was written for Windows XP.

What form property do I set to tell a windows form to accept the default Windows 8 / 10 flat theme? Is it a global setting per application or a per-form setting?

The main form and some child forms of my application look fine with modification.

However, some of my child forms still have Windows XP/7's textured look:

I read some posts that point to "EnableVisualStyles = true". However that question was asking how to get the Windows XP styles, rather than Win 95/95 styles. I need some clarification on what the setting should be for newer Win 8 / 10 theme.

Answer 1

MDI Child forms are a special type of form that is not considered a TopLevel form, and windows themes only affect TopLevel forms.

Microsoft has been deprecating the use of Multiple Document Interfaces (MDI didn't even get written into WPF) in favor of Tabbed interfaces.