White strip at top of windows that are resizable and have no titlebar (Windows 10)

[Jim Kring]

Has anyone noticed that if a window (A) has no titlebar AND (B) is resizable, then it will have a white stripe at the top of it? (see screenshot below, and note that the big titlebar is not actually a titlebar, but a styled button, and the actual titlebar is hidden)

Has anyone figured out how to get rid of this white strip (perhaps with Windows API calls)? I know I can get it to go away if I make the window NOT resizable, but I don't want that -- I need to be able to resize.

I've done a little googling and the only thing I can really find how to set up WPF properties for the windows, and I can't seem to find any magic user32.dll calls or anything like that.

Here's an example: white strip at top of window.vi

Thanks for any help or ideas.

 

Edited September 12, 2019 by Jim Kring

[Benjamin R]

Hi Jim, 

Have you try to use the Region Functions from the Windows API? You can download an LLB that call this API on here.

Below an example base on the size of a Tab control. 

 

Hope this helps.

Benjamin

[Jim Kring]

Thanks, Benjamin! Any chance you could post your example VI? I can't seem to place the snippet PNG.

[Benjamin R]

Hi Jim, 

Here an exemple. I just see that this example does not allow to resize the window. I will try to find a way to be able to do so. I know that there is a way in C# explain in this video.

Let me know if this helps. 

SizeWindowToTab.zip