void addChildWindow(MDIWindow * w);
void removeChildWindow(MDIWindow * w);
MDIWindow * getPrintPreview();
void setParentWindow(MDIWindow * p);
int getId();
void addChildWindow(MDIWindow * w);
void removeChildWindow(MDIWindow * w);
MDIWindow * getPrintPreview();
void setParentWindow(MDIWindow * p);
int getId();