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
{
		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;
		}
		
		
		return needHide( propName );
	}
	/**
	 * Returns if the property need to be hiden under some cases.
	 * 
	 * @param propName
	 *            the property name to check
	 * 
	 * @return true if the property need to be hiden under some cases, false
	 *         otherwise.
	 */
	private boolean needHide( String propName )
	{
		if ( !( ReportItemHandle.BOOKMARK_PROP.equals( propName )
				|| ReportItemHandle.TOC_PROP.equals( propName )
				|| StyleHandle.PAGE_BREAK_AFTER_PROP.equals( propName )
				|| StyleHandle.PAGE_BREAK_BEFORE_PROP.equals( propName ) || CellHandle.DROP_PROP