Bug 164070 Support widows/orphans properties on text item
Support widows/orphans properties on block text item(label, text, data etc), About the definition of widows/orphans, please refer to CSS spec.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/api/DesignElementHandleTest.java
label4Handle.setExtendsName( null ); 
		assertNull( label4Handle.getExtends( ) ); 
		label4Handle.setExtends( parentHandle );
		assertEquals( "base", label4Handle.getExtends( ).getName( ) ); 
		
		label4Handle.setExtends( null ); 
		assertNull( label4Handle.getExtends( ) ); 
		label4Handle = designHandle.findElement( "label3" ); 
		parentHandle = label4Handle.getExtends( );
		label4Handle.setExtendsElement( parentHandle.getElement( ) );
		
		label4Handle.setExtendsElement( null ); 
		assertNull( label4Handle.getExtends( ) ); 
	}
	/**
	 * Tests choices of properties on an element. Following methods have been
	 * tested:
	 * <ul>
	 * <li>
	 * {@link org.eclipse.birt.report.model.api.DesignElementHandle#getChoices(String)}
	 * </ul>
	 */
	public void testChoice( )
	{
		DesignElementHandle handle = designHandle.findElement( "bodyLabel1" ); 
		
		IChoice[] choices = handle.getChoices( Label.TEXT_PROP );
		assertNull( choices );
		choices = handle.getChoices( Style.FONT_FAMILY_PROP );