backport of XRCed changes from today

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45726 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wx/tools/XRCed/params.py

@@ -397,9 +397,11 @@ class ParamUnit(PPanel):
     def GetValue(self):
         return self.text.GetValue()
     def SetValue(self, value):
+        self.freeze = True
         if not value: value = '0'        
         self.text.SetValue(value)
         self.Change(0)
+        self.freeze = False
     def Change(self, x):
         self.freeze = True
         # Check if we are working with dialog units