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does anyone have any ideas for creating a frameless MDI child
Remove the window styles (SetWindowLong(hwnd,GWL_STYLE,GetWindowLong(hwnd,GWL_STYLE)&~WS_BORDER);) for frames WS_BORDER, WS_DLGFRAME, WS_THICKFRAME etc. or call the CreateWindowEx() without these styles.
SetWindowLong(hwnd,GWL_STYLE,GetWindowLong(hwnd,GWL_STYLE)&~WS_BORDER);)