--- a/svghmi/svghmi.py	Mon Mar 29 10:26:42 2021 +0200
+++ b/svghmi/svghmi.py	Mon Mar 29 14:35:45 2021 +0200
@@ -261,7 +261,11 @@
                 hmitree_backup_file = open(hmitree_backup_path, 'rb')
                 hmi_tree_root = HMITreeNode.from_etree(etree.parse(hmitree_backup_file).getroot())
 
-        return SVGHMI_UI(parent, Register_SVGHMI_UI_for_HMI_tree_updates)
+        ret = SVGHMI_UI(parent, Register_SVGHMI_UI_for_HMI_tree_updates)
+
+        on_hmitree_update(hmi_tree_root)
+
+        return ret
 
 class SVGHMI(object):
     XSD = """<?xml version="1.0" encoding="utf-8" ?>

--- a/svghmi/ui.py	Mon Mar 29 10:26:42 2021 +0200
+++ b/svghmi/ui.py	Mon Mar 29 14:35:45 2021 +0200
@@ -18,13 +18,6 @@
 
 from util.ProcessLogger import ProcessLogger
 
-def SVGHMIEditorUpdater(ref):
-    def SVGHMIEditorUpdate():
-        o = ref()
-        if o is not None:
-            wx.CallAfter(o.MakeTree)
-    return SVGHMIEditorUpdate
-
 class HMITreeSelector(wx.TreeCtrl):
     def __init__(self, parent):
         global on_hmitree_update
@@ -34,7 +27,6 @@
             wx.SUNKEN_BORDER |
             wx.TR_LINES_AT_ROOT))
 
-        on_hmitree_update = SVGHMIEditorUpdater(weakref.ref(self))
         self.MakeTree()
 
     def _recurseTree(self, current_hmitree_root, current_tc_root):