I can add a new column and a new row

src/myfasthtml/controls/IconsHelper.py

@@ -1,3 +1,5 @@
+from fastcore.basics import NotStr
+
 from myfasthtml.core.constants import ColumnType
 from myfasthtml.icons.fluent import question20_regular, brain_circuit20_regular, number_symbol20_regular, \
   number_row20_regular
@@ -13,7 +15,7 @@ default_icons = {
     False: checkbox_unchecked20_regular,
     
     "Brain": brain_circuit20_regular,
-    "QuestionMark" : question20_regular,
+    "QuestionMark": question20_regular,
     
     # TreeView icons
     "TreeViewFolder": folder20_regular,
@@ -46,6 +48,9 @@ class IconsHelper:
     :return: The requested icon resource if found; otherwise, returns None.
     :rtype: object or None
     """
+    if isinstance(name, NotStr):
+      return name
+    
     if name in IconsHelper._icons:
       return IconsHelper._icons[name]