Javascript code:
var Attribute = Interop.Allocate(4);
Attribute.WriteDWORD(0, 2);
Interop.Call('dwmapi.dll', 'DwmSetWindowAttribute', pPlusWnd.Handle, 2, Attribute, 4);
var _MARGINS = Interop.Allocate(8);
_MARGINS.WriteWORD(0, -1);
_MARGINS.WriteWORD(2, -1);
_MARGINS.WriteWORD(4, -1);
_MARGINS.WriteWORD(6, -1);
Interop.Call('dwmapi.dll', 'DwmExtendFrameIntoClientArea', pPlusWnd.Handle, _MARGINS);