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
*/
	void setCanExtend( boolean flag )
	{
		allowExtend = flag;
	}
	/**
	 * Returns whether elements of this class can be extended.
	 * 
	 * @return True if the element can be extended, false if not.
	 */
	public boolean canExtend( )
	{
		return allowExtend;
	}
	/**
	 * Marks this element as abstract. Users never see abstract elements: they
	 * exist to simplify the description of other elements.
	 * 
	 * @param flag
	 *            true if the element is to be abstract, false if it is to be
	 *            concrete (user-visible)
	 */
	void setAbstract( boolean flag )
	{
		abstractElement = flag;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.IObjectDefn#findProperty(java.lang.String)