Bug 123406 Add geLocaltStringProperty in GroupElementHandle and GroupPropertyHandle
Please refer to 123405. GUI need a way to get the local setting of given property because current getStringPropery method will return inherited value if there are no local value.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SimpleGroupElementHandle.java
if ( elements.isEmpty( ) )
			return false;
		for ( Iterator iter = elements.iterator( ); iter.hasNext( ); )
		{
			Object next = iter.next( );
			if ( !( next instanceof DesignElementHandle ) )
				return false;
			if ( ( (DesignElementHandle) next ).getExtends( ) == null )
				return false;
		}
		
		return true;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isPropertyReadOnly(java.lang.String)
	 */
	protected boolean isPropertyReadOnly( String propName )
	{
		for ( int i = 0; i < elements.size( ); i++ )
		{
			PropertyHandle propertyHandle = ( (DesignElementHandle) elements
					.get( i ) ).getPropertyHandle( propName );
			
			
			if ( propertyHandle != null && propertyHandle.isReadOnly( )
					|| propertyHandle == null )
				return true;
		}