def save_patch(self, event=None):
        if os.path.isfile(self.file2patch.GetValue()):
            dialog = wx.FileDialog(self.file2patch_dialog, _("Save patch"), style=wx.SAVE|wx.OVERWRITE_PROMPT)
            if dialog.ShowModal() == wx.ID_OK:
                content = codecs.open(self.file2patch.GetValue(), mode="r").readlines()
                diff = difflib.unified_diff(content, self.content.GetText().split("\n"), fromfile=self.file2patch.GetValue(), tofile=self.path, lineterm="\n")
                patch_path = dialog.GetPath()
                patch = codecs.open(patch_path, mode="w", encoding="utf-8")
                patch.writelines(diff)
                patch.close()
        else:
            dialog = wx.MesageDialog(self.file2patch_dialog,
                                     _("File to patch"),
                                     _("File selected to patch doesn't exists!"),
                                     style=wx.OK|wx.ICON_ERROR)