diff --git a/src/gui/imgview.py b/src/gui/imgview.py
--- a/src/gui/imgview.py
+++ b/src/gui/imgview.py
@@ -75,6 +75,12 @@ class ImgView(ResizableCanvas):
 		self.create_line(x-3,y-3,x+4,y+4,fill="#00ff00")
 		self.create_line(x-3,y+3,x+4,y-4,fill="#00ff00")
 
+	def setUp(self):
+		self.bind('<1>',lambda e: self.addCorner(e.x,e.y))
+
+	def setRecording(self):
+		self.bind('<1>',lambda e: None)
+
 	def _onResize(self,event):
 		w=self._width
 		super()._onResize(event)