diff --git a/src/visualizer/visualizer/core.py b/src/visualizer/visualizer/core.py
index f816c2b1d..8e874b563 100644
--- a/src/visualizer/visualizer/core.py
+++ b/src/visualizer/visualizer/core.py
@@ -527,11 +527,14 @@ class Channel(PyVizObject):
         @return none
         """
         self.channel = channel
-        self.canvas_item = GooCanvas.CanvasEllipse(radius_x=30, radius_y=30,
-                                             fill_color="white",
-                                             stroke_color="grey", line_width=2.0,
-                                             line_dash=GooCanvas.LineDash([10.0, 10.0 ]),
-                                             visibility=GooCanvas.CanvasItemVisibility.VISIBLE)
+        self.canvas_item = GooCanvas.CanvasEllipse()
+        self.canvas_item.radius_x=30
+        self.canvas_item.radius_y=30
+        self.canvas_item.fill_color="white"
+        self.canvas_item.stroke_color="grey"
+        self.canvas_item.line_width="2.0"
+        self.canvas_item.line_dash=GooCanvas.CanvasLineDash([10.0, 10.0])
+        self.canvas_item.visibility=GooCanvas.CanvasItemVisibility.VISIBLE
         self.canvas_item.pyviz_object = self
         self.links = []