Bug 145698 Name change won't enable "restore property" button
Steps to reproduce: 1.New a report, extends lib.label 2.Choose the label, switch to property editor, chang its name to "aa" 3.Choose the label again Expected result: "Restore property" button is enabled Actual result: "Restore property" button is grayed out
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/GroupElementHandle.java
abstract protected boolean isPropertyVisible( String propName );
	/**
	 * Clears values of all common properties(except the extends property) for
	 * the given collection of elements. Clearing a property removes any value
	 * set for the property on this element. After this, the element will now
	 * inherit the property from its parent element, style, or from the default
	 * value for the property.
	 * 
	 * @throws SemanticException
	 *             if the property is not defined on this element
	 */
	abstract public void clearLocalProperties( ) throws SemanticException;
	/**
	 * Returns <code>true</code> if each of the given collection of element
	 * extends has a parent. Returns <code>false</code> otherwise. If the
	 * collection has no elements, also return <code>false</code>
	 * 
	 * @return <code>true</code> if each of the given collection of element
	 *         extends has a parent. Returns <code>false</code> otherwise. If
	 *         the collection has no elements, also return <code>false</code>
	 */
	abstract public boolean isExtendedElements( );
	/**
	 * This method returnt <code>true</code> in following condition:
	 * <p>
	 * 1. The multi selected elements are same type.
	 * <p>
	 * 2. And the multi selected elements have extends.
	 * <p>
	 * 3. If any of the given elements has local properties.