I read http://doc.qt.nokia.com/latest/mainw...ckwidgets.html and would like to create an UI exactly like it.

Except:
1. centralWidget “Letter” put on right hand side, 2 DockWidgets “Customers” and “Paragraphs” put on left hand side.
2. There is a bottom DockWidget.

However, the following code put “Customers” on left hand side, “Letter” on the central, “Paragraphs” on the right hand side.

How should I change the code to fix the layout problem?

Qt Code: 
  1. QFrame *frame = new QFrame( this );
  2.     QLayout *layout = new QVBoxLayout( frame );
  3.     frame->setLayout( layout );
  4.     layout->addWidget( &m_Main );
  5.     setCentralWidget( frame );       
  6.  
  7.     m_A = new A( this );
  8.     addDockWidget( Qt::LeftDockWidgetArea, m_A );
  9.  
  10.     m_B = new B( this );
  11.     addDockWidget( Qt::LeftDockWidgetArea, m_B );
  12.  
  13.     m_C = new C( this );
  14.     addDockWidget( Qt::BottomDockWidgetArea, m_C );
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