messageviewerbase.ui Example File
messageviewer/messageviewerbase.ui

    <ui version="4.0" >
     <class>MessageViewerBase</class>
     <widget class="QWidget" name="MessageViewerBase" >
      <property name="geometry" >
       <rect>
        <x>0</x>
        <y>0</y>
        <width>196</width>
        <height>245</height>
       </rect>
      </property>
      <property name="windowTitle" >
       <string>MessageViewer</string>
      </property>
      <widget class="QStackedWidget" name="widgetStack" >
       <property name="geometry" >
        <rect>
         <x>0</x>
         <y>0</y>
         <width>16</width>
         <height>16</height>
        </rect>
       </property>
       <property name="sizePolicy" >
        <sizepolicy>
         <hsizetype>13</hsizetype>
         <vsizetype>13</vsizetype>
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="currentIndex" >
        <number>0</number>
       </property>
       <widget class="QWidget" name="page" />
       <widget class="QWidget" name="page_2" />
      </widget>
     </widget>
     <resources/>
     <connections/>
    </ui>