Bug 142432 MasterPage from library can't be restored to modify
Details: MasterPage from library can't be restored to modify Step: 1.New a library named lib1, and insert a masterpage named lib-mp. 2.Publish the library into resource folder. 3.New a report design and use lib1. 4.Drop the lib-mp from library explorer into outline of report design. 5.Double click lib-mp, and switch to Property editro tab. 6.Click restore. Actual result: Pop up an error message and said that the master page cannot specify size the page type is not custom.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SimpleGroupElementHandle.java
return !needHide( propName );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#clearLocalProperties()
	 */
	public void clearLocalProperties( ) throws SemanticException
	{
		ActivityStack stack = module.getActivityStack( );
		stack.startTrans( );
		try
		{
			Iterator iter = propertyIterator( );
			while ( iter.hasNext( ) )
			{
				GroupPropertyHandle propHandle = (GroupPropertyHandle) iter
						.next( );
				String propName = propHandle.getPropertyDefn( ).getName( );
				if ( DesignElement.EXTENDS_PROP.equals( propName ) )
				{
					
					continue;
				}
				propHandle.clearValue( );
			}
		}
		catch ( SemanticException e )
		{
			stack.rollback( );