for anybody interested in this topic:

a
Qt Code: 
  1. QString QmInfoPanelPlugin::domXml() const {
  2.    return "<ui language=\"c++\">\n"
  3.           "   <widget class=\"QmInfoPanel\" name=\"qmInfoPanel\">\n"
  4.           "      <property name=\"geometry\">\n"
  5.           "         <rect>\n"
  6.           "            <x>0</x>\n"
  7.           "            <y>0</y>\n"
  8.           "            <width>100</width>\n"
  9.           "            <height>100</height>\n"
  10.           "         </rect>\n"
  11.           "      </property>\n"
  12.           "   </widget>\n"
  13.           "   <customwidgets>\n"
  14.           "     <customwidget>\n"
  15.           "       <class>QmInfoPanel</class>\n"
  16.           "       <propertyspecifications>\n"
  17.           "          <stringpropertyspecification name=\"test\" type=\"richtext\"/>\n"
  18.           "       </propertyspecifications>\n"
  19.           "     </customwidget>\n"
  20.           "   </customwidgets>\n"
  21.           "</ui>\n";
  22. }
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will do the job

Hope it helps

Michael