diff --git a/forms.py b/forms.py
index 7ef7001..02a70a7 100644
--- a/forms.py
+++ b/forms.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 
-import sys
 import wx
 import wx.gizmos
 import wx.grid
@@ -230,9 +229,10 @@ class MainFrame(wx.Frame):
 
         tb1.AddSimpleTool(ID_ADD_MODEL_SELECTED, "model-new", wx.Bitmap('share/model-add.png'),
             'Add spacification to selected model')
-        tb1.AddSeparator()
         tb1.AddSimpleTool(ID_DUPLICATE_MODEL, "model-dup", wx.Bitmap('share/model-dup.png'),
             'Duplicate selected model')
+        tb1.AddSimpleTool(ID_DUPLICATE_TREE, "model-dup-tree", wx.Bitmap('share/model-dup-tree.png'),
+            'Duplicate selected model and all submodels')
         tb1.AddSimpleTool(ID_DELETE_MODEL, "model-del", wx.Bitmap('share/model-delete.png'),
             'Delete selected model')
         tb1.AddSeparator()
@@ -352,16 +352,29 @@ class SizeSelector(wx.Dialog):
     def GetValues(self):
         return self.width.GetValue(), self.height.GetValue()
 
+HandCursorImage = wx.Image('share/cursor-openhand.png')
+GrabHandCursorImage = wx.Image('share/cursor-closedhand.png')
+
 class PlotFrame(wx.Frame):
     def __init__(self, parent, title):
         wx.Frame.__init__ (self, parent, -1, title, size = wx.Size(600, 400))
 
         self.plot = wxplot.PlotCanvas(self)
+
+        # стандартные курсоры компонента настолько монстроуозные,
+        # что их просто необходимо заменить на что-нибудь приличное
+        self.plot.canvas.SetCursor(wx.STANDARD_CURSOR)
+        self.plot.HandCursor = wx.CursorFromImage(HandCursorImage)
+        self.plot.GrabHandCursor = wx.CursorFromImage(GrabHandCursorImage)
+        # все равно не используется
+        # self.plot.MagCursor = wx.StockCursor(wx.CURSOR_MAGNIFIER)
+
         self.plot.SetGridColour(wx.Color(200, 200, 200))
         self.plot.SetEnableGrid(True)
         self.plot.SetEnableAntiAliasing(True)
         self.plot.SetEnableHiRes(True)
         self.plot.SetEnableLegend(True)
+        self.plot.SetEnableDrag(True)
 
         self.Centre(wx.BOTH)
 
@@ -371,6 +384,15 @@ class PlotFrame(wx.Frame):
         menubar.Append(menu, 'Plot')
         self.SetMenuBar(menubar)
 
+        self.plot.Bind(wx.EVT_MOUSEWHEEL, self.OnZoom)        
+
+    def OnZoom(self, event):
+        x = event.GetX()
+        y = event.GetY()
+        r = event.GetWheelRotation()
+        x, y = self.plot.PositionScreenToUser((x, y))
+        delta = 0.8/1.0 if r > 0 else 1.0/0.8
+        self.plot.Zoom((x, y), (delta, delta))
 
 class AboutDialog(wx.Dialog):
     def __init__(self, parent):
diff --git a/opal.py b/opal.py
index 6b0ca5a..73522e2 100644
--- a/opal.py
+++ b/opal.py
@@ -18,8 +18,6 @@ import wx.propgrid as wxpg
 import wx.lib.plot as wxplot
 import forms
 import time
-import datetime
-import os
 import threading
 import re
 from wx.lib.embeddedimage import PyEmbeddedImage
@@ -85,7 +83,7 @@ class MainFrame(forms.MainFrame):
         # События компонентов
 
         self.m_user_models.Bind(wx.EVT_TREE_SEL_CHANGED,
-            self.OnModelActivated)
+            self.OnModelSelected)
         self.m_user_models.Bind(wx.EVT_TREE_DELETE_ITEM,
             self.OnDeleteModelsItem)
         self.m_params.Bind(wxpg.EVT_PG_CHANGING,
@@ -441,7 +439,7 @@ class MainFrame(forms.MainFrame):
             pg.Append(wxpg.StringProperty(label, value = str(param.GetValue())))
         pg.SetSplitterLeft()
 
-    def OnModelActivated(self, event):
+    def OnModelSelected(self, event):
         item = event.GetItem()
         data = self.m_user_models.GetPyData(item)
         if data:
@@ -474,6 +472,8 @@ class MainFrame(forms.MainFrame):
         param = prop.GetClientData()
         item, data = self.GetSelectedItemData(um)
         data.mdef[param] = value
+        # так как значение параметра изменилось,
+        # то все субмодели должны быть пересчитаны
         Walk(item)
 
 
diff --git a/plot.png b/plot.png
deleted file mode 100644
index 416591c..0000000
Binary files a/plot.png and /dev/null differ
diff --git a/server.py b/server.py
index 8b7c255..a16f73b 100644
--- a/server.py
+++ b/server.py
@@ -12,13 +12,11 @@
 # -*- coding: UTF-8 -*-
 
 import os
-import sys
 import json
 import time
 import datetime
 import threading
 import subprocess
-import logging
 
 import task
 
@@ -327,7 +325,7 @@ class Job:
 
 #-------------------------------------------------------------------------------
 
-import time, random
+import random
 from pprint import pprint
 
 def main():
diff --git a/share/cursor-closedhand.png b/share/cursor-closedhand.png
new file mode 100644
index 0000000..b78dd1d
Binary files /dev/null and b/share/cursor-closedhand.png differ
diff --git a/share/cursor-openhand.png b/share/cursor-openhand.png
new file mode 100644
index 0000000..d2b9078
Binary files /dev/null and b/share/cursor-openhand.png differ
diff --git a/share/model-dup-tree.png b/share/model-dup-tree.png
new file mode 100644
index 0000000..db45111
Binary files /dev/null and b/share/model-dup-tree.png differ