diff -r a6ff2b3fcc25 -r 2245e8776086 graphics/GraphicCommons.py
--- a/graphics/GraphicCommons.py	Mon Sep 10 16:12:29 2007 +0200
+++ b/graphics/GraphicCommons.py	Mon Sep 10 18:16:07 2007 +0200
@@ -229,8 +229,9 @@
         self.Redraw()
 
     # Method that erase the last box and draw the new box
-    def Redraw(self):
-        dc = self.drawingSurface.GetLogicalDC()
+    def Redraw(self, dc = None):
+        if not dc:
+            dc = self.drawingSurface.GetLogicalDC()
         dc.SetPen(wx.Pen(wx.WHITE, 1, wx.DOT))
         dc.SetBrush(wx.TRANSPARENT_BRUSH)
         dc.SetLogicalFunction(wx.XOR)
@@ -242,20 +243,22 @@
             # Draw current box
             dc.DrawRectangle(self.currentBox.x, self.currentBox.y, self.currentBox.width,
                 self.currentBox.height)
-
+    
     # Erase last box
-    def Erase(self):
-        dc = self.drawingSurface.GetLogicalDC()
+    def Erase(self, dc = None):
+        if not dc:
+            dc = self.drawingSurface.GetLogicalDC()
         dc.SetPen(wx.Pen(wx.WHITE, 1, wx.DOT))
         dc.SetBrush(wx.TRANSPARENT_BRUSH)
         dc.SetLogicalFunction(wx.XOR)
         if self.lastBox:
             dc.DrawRectangle(self.lastBox.x, self.lastBox.y, self.lastBox.width,
                 self.lastBox.height)
-        
+    
     # Draw current box
-    def Draw(self):
-        dc = self.drawingSurface.GetLogicalDC()
+    def Draw(self, dc = None):
+        if not dc:
+            dc = self.drawingSurface.GetLogicalDC()
         dc.SetPen(wx.Pen(wx.WHITE, 1, wx.DOT))
         dc.SetBrush(wx.TRANSPARENT_BRUSH)
         dc.SetLogicalFunction(wx.XOR)
@@ -264,7 +267,6 @@
             dc.DrawRectangle(self.currentBox.x, self.currentBox.y, self.currentBox.width,
                 self.currentBox.height)
 
-
 #-------------------------------------------------------------------------------
 #                           Graphic element base class
 #-------------------------------------------------------------------------------
@@ -451,6 +453,7 @@
             if self.Dragging:
                 self.oldPos = pos
                 self.ProcessDragging(movex, movey)
+            return True
         # If cursor just pass over the element, changes the cursor if it is on a handle
         else:
             pos = event.GetLogicalPosition(dc)
@@ -461,6 +464,7 @@
             if cursor != self.CurrentCursor:
                 self.Parent.SetCursor(CURSORS[cursor])
                 self.CurrentCursor = cursor
+            return False
 
     # Moves the element
     def Move(self, dx, dy, exclude = []):
@@ -1578,6 +1582,7 @@
                     if self.CurrentCursor != 5:
                         self.CurrentCursor = 5
                         wx.CallAfter(self.Parent.SetCursor, CURSORS[5])
+                return False
             else:
                 # Test if a point has been handled
                 #result = self.TestPoint(pos)
@@ -1590,10 +1595,10 @@
                 #    self.OverStart = False
                 #    self.OverEnd = False
                 # Execute the default method for a graphic element
-                Graphic_Element.OnMotion(self, event, dc, scaling)
+                return Graphic_Element.OnMotion(self, event, dc, scaling)
         else:
             # Execute the default method for a graphic element
-            Graphic_Element.OnMotion(self, event, dc, scaling)
+            return Graphic_Element.OnMotion(self, event, dc, scaling)
     
     # Refreshes the wire state according to move defined and handle selected
     def ProcessDragging(self, movex, movey):