Управление размещением виджетов

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Как можно сделать, не используя код, что бы у меня в месте с окном растягивались пропорционально и виджеты? Программа пишеться в qtCreater

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>785</width>
    <height>738</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="maximumSize">
   <size>
    <width>16777215</width>
    <height>16777215</height>
   </size>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <property name="maximumSize">
    <size>
     <width>785</width>
     <height>703</height>
    </size>
   </property>
   <widget class="QWidget" name="">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>0</y>
      <width>771</width>
      <height>691</height>
     </rect>
    </property>
    <layout class="QVBoxLayout" name="verticalLayout">
     <property name="sizeConstraint">
      <enum>QLayout::SetMaximumSize</enum>
     </property>
     <item>
      <widget class="QTabWidget" name="tabWidget">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="maximumSize">
        <size>
         <width>16777215</width>
         <height>150</height>
        </size>
       </property>
       <property name="currentIndex">
        <number>0</number>
       </property>
       <widget class="QWidget" name="tab">
        <attribute name="title">
         <string>Tab 1</string>
        </attribute>
       </widget>
       <widget class="QWidget" name="tab_2">
        <attribute name="title">
         <string>Tab 2</string>
        </attribute>
       </widget>
      </widget>
     </item>
     <item>
      <widget class="QScrollArea" name="scrollArea">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="widgetResizable">
        <bool>true</bool>
       </property>
       <widget class="QWidget" name="scrollAreaWidgetContents">
        <property name="geometry">
         <rect>
          <x>0</x>
          <y>0</y>
          <width>767</width>
          <height>531</height>
         </rect>
        </property>
       </widget>
      </widget>
     </item>
    </layout>
   </widget>
  </widget>
  <widget class="QToolBar" name="mainToolBar">
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

PS:Заранее спасибо