From 10691d9d1d27afa8fae3dc0f8331dc2d0b70679e Mon Sep 17 00:00:00 2001
From: luukkainen <luukkainen@ac1ea38d-2e2b-0410-8846-a27921b304fc>
Date: Thu, 31 Jan 2013 11:24:48 +0000
Subject: [PATCH] fixes #4041

git-svn-id: https://www.simantics.org/svn/simantics/sysdyn/trunk@26714 ac1ea38d-2e2b-0410-8846-a27921b304fc
---
 .../jfreechart/chart/properties/ChartVariable.java     | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/org.simantics.jfreechart/src/org/simantics/jfreechart/chart/properties/ChartVariable.java b/org.simantics.jfreechart/src/org/simantics/jfreechart/chart/properties/ChartVariable.java
index 331f3fff..fb352277 100644
--- a/org.simantics.jfreechart/src/org/simantics/jfreechart/chart/properties/ChartVariable.java
+++ b/org.simantics.jfreechart/src/org/simantics/jfreechart/chart/properties/ChartVariable.java
@@ -1,6 +1,6 @@
 package org.simantics.jfreechart.chart.properties;
 
-public class ChartVariable {
+public class ChartVariable implements Comparable<ChartVariable>{
 	
 	private String rvi;
 	private String label;
@@ -43,5 +43,13 @@ public class ChartVariable {
 		ChartVariable other = (ChartVariable)obj;
 		return rvi.equals(other.rvi);
 	}
+	
+	@Override
+	public int compareTo(ChartVariable o) {
+		if (label != null && o.label != null) {
+			return label.compareTo(o.label);
+		}
+		return rvi.compareTo(o.rvi);
+	}
 
 }
-- 
2.47.1