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<h4>startObserving</h4>
<pre>void&nbsp;startObserving()</pre>
<div class="block">Start observing the subject. This method should register callback listeners on any properties
 of the subject that would affect its rendered representation.
 <P>
 Invoking this method should generally refresh the state of the item.
 <P>
 <B>This method may not be invoked on the GL context thread.</B></div>
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