diff -r 70768bd1dab3 -r 4e3c78a84c64 controls/CustomIntCtrl.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/controls/CustomIntCtrl.py	Fri Sep 15 20:01:21 2017 +0300
@@ -0,0 +1,88 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# This file is part of Beremiz, a Integrated Development Environment for
+# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
+#
+# Copyright (C) 2017: Andrey Skvortsov
+#
+# See COPYING file for copyrights details.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+
+import wx
+from wx.lib.intctrl import IntCtrl
+
+
+class CustomIntUpdatedEvent(wx.PyCommandEvent):
+    def __init__(self, id, value=0, object=None):
+        wx.PyCommandEvent.__init__(self, CustomIntCtrl.wxEVT_COMMAND_CUSTOM_INT_UPDATED, id)
+
+        self.__value = value
+        self.SetEventObject(object)
+
+    def GetValue(self):
+        """Retrieve the value of the control at the time
+        this event was generated."""
+        return self.__value
+
+
+class CustomIntCtrl(wx.lib.intctrl.IntCtrl):
+    """
+    This class provides a control that takes and returns long as
+    value, and provides bounds support and optional value limiting.
+
+    It handles entering negative numbers more user-friendly than
+    original wx.lib.intctrl.IntCtrl.
+
+    It applies limits as focus is changed to other control and
+    sends event afterwards to signal that editing is done.
+    """
+
+    # Used to trap events indicating that the current
+    # integer value of the control has been changed.
+    wxEVT_COMMAND_CUSTOM_INT_UPDATED = wx.NewEventType()
+    EVT_CUSTOM_INT = wx.PyEventBinder(wxEVT_COMMAND_CUSTOM_INT_UPDATED, 1)
+
+    def __init__(self, *args, **kwargs):
+        wx.lib.intctrl.IntCtrl.__init__(self, *args, **kwargs)
+        self.Bind(wx.EVT_KILL_FOCUS, self.UpdateValue)
+        self.SetLongAllowed(True)
+        self.SetLimited(False)
+
+    def GetValue(self):
+        """
+        Returns integer (long) value of the control,
+        but handles entering negative numbers
+        """
+        s = wx.TextCtrl.GetValue(self)
+        if s == '-':
+            s = ''
+        return self._fromGUI(s)
+
+    def GetValueStr(self):
+        """Returns string value of TextCtrl"""
+        return wx.TextCtrl.GetValue(self)
+
+    def UpdateValue(self, event):
+        self.SetLimited(True)
+        self.SetLimited(False)
+        try:
+            self.GetEventHandler().ProcessEvent(
+                CustomIntUpdatedEvent(self.GetId(), self.GetValue(), self))
+        except ValueError:
+            return
+        event.Skip()