Bug 139110 GUI enhancement to support create subquery more conveniently.
Description: GUI enhancement to support create subquery more conveniently. Steps to reproduce: Subquery means insert table/list inside another table/list item, and the inner table/list item doesn't has its own dataset binding. In latest build, if you want to creat a subquery structure, you have to use dataSetRow as binding expression for data items in inner table/list item. For example: 1. Insert a list, generate column data binding for it. 2. Add a group for the list. 3. Insert table to list group header which is used to display data rows in list group. Dont' bind table to dataset. 4. Insert a data to table detail row. 5. New a binding column for data, click to Open Expression Builder. The issue is that only "Availabel column bindings" is listed in Category but no "Available Data Sets". So I have to type dataSetRow[".."] by myself to generate correct subquery. For users, maybe they will mistakenly use "Available column bindings" which will generate expression like row._outer[".."] and get wrong result. So it is recommended to add "Available Data Sets" in Expression Builder for such case.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
return getClasses( new AlphabeticallyComparator( ) );
	}
	public static List getClasses( Comparator comp )
	{
		List classes = DesignEngine.getMetaDataDictionary( ).getClasses( );
		Collections.sort( classes, comp );
		return classes;
	}
	public static List getMethods( IClassInfo classInfo )
	{
		return getMethods( classInfo, new AlphabeticallyComparator( ) );
	}
	public static List getMethods( IClassInfo classInfo, Comparator comp )
	{
		List methods = classInfo.getMethods( );
		Collections.sort( methods, comp );
		return methods;
	}
	public static List getMembers( IClassInfo classInfo )
	{
		return getMembers( classInfo, new AlphabeticallyComparator( ) );
	}
	public static List getMembers( IClassInfo classInfo, Comparator comp )
	{
		List members = classInfo.getMembers( );
		Collections.sort( members, comp );
		return members;
	}
	/**
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