/**
\page page_observer_widgets Observer Widgets

<table CELLPADDING=0 style="width:100%;
  table-layout:fixed;
	margin:0px 0px 0px 0px;
	border-width:0px 0px 0px 0px; 
	border-color:#7F7F7F;">
<tr> 

<td style="width:80%; padding:0px 5px 0px 0px; vertical-align: text-top; text-align: left">
<h1 style="margin:0px; padding:0px">Overview</h1>

%Qtilities provides a powerful implementation of the subject-observer pattern and an easy way to display the contents of such an observer context. The main class to use