SVGHMI - prepare page with cached data when switching. This prevents values that do not change and that was already subscribed in previous page from keeping undefined.
from __future__ import absolute_import
from etherlab.etherlab import *
from util.BitmapLibrary import AddBitmapFolder
import util.paths as paths
AddBitmapFolder(os.path.join(paths.AbsDir(__file__), "images"))