How to make a window not realizable?

Hi,

I love this project since it provides native UI outlook. My question is, when I make up a window based on it, I could resize it by dragging it edges and then the layout inside the window is shifted which looks ugly. How could I prevent this? I check the ui and libui header files and repository issues, there is no answer.

Thanks.

PS. Is there any confirmation message box widget, which has two buttons - "YES" or "NO" ?