Bug 185280 Expression Builder: category options rearrangement.
In expression builder under category, Available Column Bindings and Available Data sets should be listed together. Right now 'Available Column Bindings' is the first option and 'Available Data sets' is the last.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/BindingExpressionProvider.java
return columnList;
			}
			catch ( SemanticException e )
			{
				ExceptionHandler.handle( e );
				return Collections.EMPTY_LIST;
			}
		}
		return super.getChildrenList( parent );
	}
	/**
	 * Get output parameters if handle has.
	 * @param handle
	 * @return
	 */
	private List getOutputList( DataSetHandle handle )
	{
		List outputList = new ArrayList( );
		PropertyHandle parameters = handle.getPropertyHandle( DataSetHandle.PARAMETERS_PROP );
		Iterator iter = parameters.iterator( );
		if ( iter != null )
		{
			while ( iter.hasNext( ) )
			{
				Object dataSetParameter = iter.next( );
				if ( ( (DataSetParameterHandle) dataSetParameter ).isOutput( ) == true )
				{
					outputList.add( dataSetParameter );
				}
			}