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
*         type
	 * 
	 * @throws SemanticException
	 */
	public static ActionHandle setAction( ReportItemHandle element,
			Action action ) throws SemanticException
	{
		ActionHandle actionHandle = null;
		if ( element instanceof LabelHandle )
		{
			actionHandle = ( (LabelHandle) element ).setAction( action );
		}
		else if ( element instanceof DataItemHandle )
		{
			actionHandle = ( (DataItemHandle) element ).setAction( action );
		}
		else if ( element instanceof ImageHandle )
		{
			actionHandle = ( (ImageHandle) element ).setAction( action );
		}
		return actionHandle;
	}
	private static Object getModelFontSize( DesignElementHandle handle )
	{
		
		
		
		StyleHandle styleHandle = handle.getPrivateStyle( );
		Object fontSizeValue = null;
		if ( styleHandle != null )