Update app2.py

app2.py

@@ -30,9 +30,9 @@ button2 = pn.widgets.Button(icon='file-analytics', name='My papers', icon_size='
 button3 = pn.widgets.Button(icon='settings', icon_size='1.5em', name='Settings', button_type='primary', button_style='outline', width=140)
 
 # Custom RadioButtonGroup widget with additional value_change event
-class CustomRadioButtonGroup(pn.widgets.RadioButtonGroup):
-    value = pn.Param(None, doc="The selected value").tag(sync=True)
-    value_change = pn.Param(None, doc="Event that is triggered when the value changes").tag(sync=True, events=True)
+class CustomRadioButtonGroup(pn.viewable.Viewable):
+    value = pn.Any(None, doc="The selected value").tag(sync=True)
+    value_change = pn.Any(None, doc="Event that is triggered when the value changes").tag(sync=True, events=True)
 
     def _process_events(self, events):
         changed = super()._process_events(events)