Problem with QDockWidget

[Banjo]

Hello

Here is the ui file

<ui version="4.0" >
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow" >
  <property name="geometry" >
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle" >
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget" >
   <widget class="Line" name="line" >
    <property name="geometry" >
     <rect>
      <x>663</x>
      <y>50</y>
      <width>20</width>
      <height>481</height>
     </rect>
    </property>
    <property name="orientation" >
     <enum>Qt::Vertical</enum>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar" >
   <property name="geometry" >
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar" />
 </widget>
 <resources/>
 <connections/>
</ui>

<ui version="4.0" >
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow" >
  <property name="geometry" >
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle" >
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget" >
   <widget class="Line" name="line" >
    <property name="geometry" >
     <rect>
      <x>663</x>
      <y>50</y>
      <width>20</width>
      <height>481</height>
     </rect>
    </property>
    <property name="orientation" >
     <enum>Qt::Vertical</enum>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar" >
   <property name="geometry" >
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar" />
 </widget>
 <resources/>
 <connections/>
</ui>

To copy to clipboard, switch view to plain text mode 

Thanks again