I'd like when the user resizes the main window of my app, the graphicsView to be resized too (that it scales the graphics scene)

Structure of the widgets is:

Qt Code: 
  1. main window
  2.   central widget with layout
  3.     graphics view
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I am using Qt Creator 1.3.0 based on Qt 4.6.0 working on windows.

UI is as follows:
Qt Code: 
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <ui version="4.0">
  3.  <class>Marias</class>
  4.  <widget class="QMainWindow" name="Marias">
  5.   <property name="geometry">
  6.    <rect>
  7.     <x>0</x>
  8.     <y>0</y>
  9.     <width>802</width>
  10.     <height>641</height>
  11.    </rect>
  12.   </property>
  13.   <property name="windowTitle">
  14.    <string>OpenMarias</string>
  15.   </property>
  16.   <widget class="QWidget" name="centralWidget">
  17.    <property name="sizePolicy">
  18.     <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
  19.      <horstretch>0</horstretch>
  20.      <verstretch>0</verstretch>
  21.     </sizepolicy>
  22.    </property>
  23.    <property name="cursor">
  24.     <cursorShape>ArrowCursor</cursorShape>
  25.    </property>
  26.    <layout class="QVBoxLayout" name="verticalLayout">
  27.     <property name="spacing">
  28.      <number>0</number>
  29.     </property>
  30.     <property name="margin">
  31.      <number>0</number>
  32.     </property>
  33.     <item>
  34.      <widget class="QGraphicsView" name="graphicsView">
  35.       <property name="sizePolicy">
  36.        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
  37.         <horstretch>0</horstretch>
  38.         <verstretch>0</verstretch>
  39.        </sizepolicy>
  40.       </property>
  41.       <property name="cursor" stdset="0">
  42.        <cursorShape>ArrowCursor</cursorShape>
  43.       </property>
  44.       <property name="styleSheet">
  45.        <string notr="true">background-color: qlineargradient(spread:pad, x1:0, y1:0, x2:0, y2:1, stop:0 rgba(0, 0, 0, 255), stop:1 rgba(0, 120, 0, 255));</string>
  46.       </property>
  47.       <property name="lineWidth">
  48.        <number>1</number>
  49.       </property>
  50.       <property name="backgroundBrush">
  51.        <brush brushstyle="NoBrush">
  52.         <color alpha="255">
  53.          <red>16</red>
  54.          <green>127</green>
  55.          <blue>35</blue>
  56.         </color>
  57.        </brush>
  58.       </property>
  59.       <property name="interactive">
  60.        <bool>true</bool>
  61.       </property>
  62.       <property name="sceneRect">
  63.        <rectf>
  64.         <x>0.000000000000000</x>
  65.         <y>0.000000000000000</y>
  66.         <width>800.000000000000000</width>
  67.         <height>600.000000000000000</height>
  68.        </rectf>
  69.       </property>
  70.       <property name="alignment">
  71.        <set>Qt::AlignCenter</set>
  72.       </property>
  73.       <property name="resizeAnchor">
  74.        <enum>QGraphicsView::NoAnchor</enum>
  75.       </property>
  76.       <property name="viewportUpdateMode">
  77.        <enum>QGraphicsView::MinimalViewportUpdate</enum>
  78.       </property>
  79.      </widget>
  80.     </item>
  81.    </layout>
  82.   </widget>
  83.   <widget class="QMenuBar" name="menuBar">
  84.    <property name="geometry">
  85.     <rect>
  86.      <x>0</x>
  87.      <y>0</y>
  88.      <width>802</width>
  89.      <height>20</height>
  90.     </rect>
  91.    </property>
  92.    <widget class="QMenu" name="menuGame">
  93.     <property name="title">
  94.      <string>Game</string>
  95.     </property>
  96.     <addaction name="actionNew_game"/>
  97.     <addaction name="actionQuit"/>
  98.     <addaction name="actionSettings"/>
  99.    </widget>
  100.    <widget class="QMenu" name="menuHelp">
  101.     <property name="title">
  102.      <string>Help</string>
  103.     </property>
  104.     <addaction name="actionAbout"/>
  105.    </widget>
  106.    <addaction name="menuGame"/>
  107.    <addaction name="menuHelp"/>
  108.   </widget>
  109.   <widget class="QStatusBar" name="statusBar"/>
  110.   <action name="actionNew_game">
  111.    <property name="text">
  112.     <string>New game</string>
  113.    </property>
  114.    <property name="shortcut">
  115.     <string>Ctrl+N</string>
  116.    </property>
  117.   </action>
  118.   <action name="actionQuit">
  119.    <property name="text">
  120.     <string>Quit</string>
  121.    </property>
  122.    <property name="shortcut">
  123.     <string>Esc, Ctrl+Q</string>
  124.    </property>
  125.   </action>
  126.   <action name="actionAbout">
  127.    <property name="text">
  128.     <string>About</string>
  129.    </property>
  130.   </action>
  131.   <action name="actionSettings">
  132.    <property name="text">
  133.     <string>Settings</string>
  134.    </property>
  135.   </action>
  136.  </widget>
  137.  <layoutdefault spacing="6" margin="11"/>
  138.  <resources/>
  139.  <connections/>
  140. </ui>
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