Bug 155943 "Restore Properties" is always enabled for extended chart
Steps to reproduce: 1.New a report, includes a library, extends lib.chart 2.Choose the chart Expected result: "Restore Properties" is disabled untill set/change any local properties for the chart Actual result: "Restore Properties" is always enabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
* @see org.eclipse.birt.report.model.design.elements.DesignVisitor#visitFreeForm(org.eclipse.birt.report.model.design.elements.Container)
	 */
	public void visitFreeForm( FreeForm obj )
	{
		writer.startElement( DesignSchemaConstants.FREE_FORM_TAG );
		super.visitFreeForm( obj );
		writeContents( obj, FreeForm.REPORT_ITEMS_SLOT,
				DesignSchemaConstants.REPORT_ITEMS_TAG );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.design.elements.DesignVisitor#visitDataItem(org.eclipse.birt.report.model.design.elements.DataItem)
	 */
	public void visitDataItem( DataItem obj )
	{
		
		boundColumnsMgr.dealData( obj, getModule( ) );
		writer.startElement( DesignSchemaConstants.DATA_TAG );
		super.visitDataItem( obj );
		property( obj, DataItem.RESULT_SET_COLUMN_PROP );
		resourceKey( obj, DataItem.HELP_TEXT_KEY_PROP, DataItem.HELP_TEXT_PROP );
		writeAction( obj, DataItem.ACTION_PROP );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitMultiLineDataItem(org.eclipse.birt.report.model.elements.TextDataItem)