Bug 148761 Unable to copy a report item from template to report
Steps: 1. Create a template, add a Text item "t1" or others 2. Create template item using "t1" 3. Double click the template item and we get a report item again. 4. We copy the item, paste to another report file. Expected: the text item can be copied. Actual result: Nothing happened, not copied and no error msg.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementDefn.java
* Whether this element can be extended. If true, elements of this type can
	 * extend from another element of the same type. If false, elements cannot
	 * extend.
	 */
	protected boolean allowExtend = true;
	/**
	 * Determines which class that this element belongs to.
	 */
	protected String javaClass = null;
	/**
	 * The collection of semantic validation trigger definition.
	 */
	private SemanticTriggerDefnSet triggerDefnSet = null;
	/**
	 * The list contains the information that how the property sheet shows an
	 * property for an extension element.
	 */
	protected Map propVisibilites = null;
	/**
	 * The name of the XML element used when serializing this ROM element.
	 */
	protected String xmlElement;
	/**
	 * Sets the Java class which implements this element.
	 * 
	 * @param theClass
	 *            the Java class to set
	 */
	void setJavaClass( String theClass )
	{