a problem with QScrollArea

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C++

QT

hi.i have program it has some classes.one of these classes inherites from QMainwindow.i write blew code to put QScrollArea in this code.i have two problem.1_ two windows open(main window of program with a empty window).2_ when main window is in minimum state,it shows horizontal and vertical Scroll but when is in maximum state,it shows only vertical Scroll.i put two QLabel in main window that is shown Incompletely.
(sorry for english )

#include <QScrollArea>
private:
     QWidget* wi;
     QPushButton* La_yellow;
     QPushButton* La_green;
     QScrollArea* H;
//////////////////////
 wi=new QWidget;
    wi->resize((row-1)*60+400,(co-1)*60+400);
    wi->setFixedSize((row-1)*60+400,(co-1)*60+400);
setCentralWidget(wi);
La_yellow->move((row-1)*60+400-220,(co-1)*60+400-80);
     La_green->move((row-1)*60+400-220,(co-1)*60+400-10);
La_yellow->setParent(wi);
     La_green->setParent(wi);
H=new QScrollArea();
     H->setWidget(wi);
     H->raise();
      H->show();

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