I want to use borderless window with cef browser as it's child - with be able to resize/move application window. The thing is that without cef, window resize or move works fine and it is possible to setup areas where exactly are - this resize areas on window and where move area(caption). But when cef browser covering whole client area(borders and caption too) by it's own window all messages like WM_* doesn't reach main application window. So solution was to subclass cef browser and cef browser child with proc function where WM_NCHITTEST must return HTTRANSPARENT. But the problem is WM_NCHITTEST never fires/run/reaches in that subclass functions on cef. So impossible then to return HTTRANSPARENT and handle resize and move by main application window proc function. While WM_LBUTTONUP for example works there. So I don't understand why WM_LBUTTONUP works, while WM_NCHITTEST not working in subclass of cef browser and it's childs?
Also WM_LBUTTONDOWN not work too, while WM_LBUTTONUP works.