replace null with item

dpavsrtrl · dpavsrtrl · commit 7489a60a0be6 · 2018-04-26T14:21:58.000-04:00
diff --git a/Source/OxyPlot/Series/RectangleSeries.cs b/Source/OxyPlot/Series/RectangleSeries.cs
@@ -288,7 +288,7 @@ public override TrackerHitResult GetNearestPoint(ScreenPoint point, bool interpo
                             Text = StringHelper.Format(
                             this.ActualCulture,
                             this.TrackerFormatString,
-                            null,
+                            item,
                             this.Title,
                             this.XAxis.Title ?? DefaultXAxisTitle,
                             this.XAxis.GetValue(p.X),
