DWMWA_ALLOW_NCPAINT constant
int
const DWMWA_ALLOW_NCPAINT
Use with DwmSetWindowAttribute. Enables content rendered in the non-client area to be visible on the frame drawn by DWM. The pvAttribute parameter points to a value of type BOOL. TRUE to enable content rendered in the non-client area to be visible on the frame; otherwise, FALSE.
Implementation
static const DWMWA_ALLOW_NCPAINT = 4;