W3bbo said:ploe said:*snip*
Can you post your code?
I'm an idiot. I couldn't find the bug because it wasn't in the window's code, but our base class that it extends. The other windows where the title update does work inherits a different base class.
In our base class we disabled painting while the window was in a state of populating data (because we were getting flicker) with this line:
SendMessage(this.Handle, WM_SETREDRAW, 0, IntPtr.Zero);
We re-enabled painting when it is done populating with this line:
SendMessage(this.Handle, WM_SETREDRAW, 1, IntPtr.Zero);
Then we call Invalidate(true). But that just invalidates the client area, not the non-client area, hence why the title bar was not re-painting.
Invalidate and paint the ENTIRE window by calling: InvalidateRect() and then UpdateWindow().
Sorry for the wild goose chase.