how VC C + + child windows are displayed in full screen

child window Full screen you must remove the child window properties into a pop-up window and the parent window to the desktop null, or because the Father window is not full screen, so it cannot be full screen, must be converted to child window properties and parent window when restoring

Recovery window

if (M_bfullsceen)
{
M_pwndsave->showwindow (Sw_show);
SetParent (M_pwndsave);
ModifyStyle (Ws_popup,ws_child);
SetWindowPlacement (&m_wpmsave);
}

Full Screen window

Else
{
int cx =:: GetSystemMetrics (Sm_cxscreen);
int cy =:: GetSystemMetrics (Sm_cyscreen);

GetWindowPlacement (&m_wpmsave);
ModifyStyle (Ws_child,ws_popup);
M_pwndsave = SetParent (NULL);
M_pwndsave->showwindow (Sw_hide);
MoveWindow (0, 0, CX, CY);
}