Update app2.py

app2.py

@@ -20,24 +20,27 @@ class MainBody(param.Parameterized):
 
 main_body_instance = MainBody()
 
-class CustomRadioButtonGroup(pn.widgets.RadioButtonGroup):
-    value = param.String(default=None)
-    value_change = param.Event()
-
-    @param.depends('value', watch=True)
-    def _value_change_handler(self):
-        self.param.trigger('value_change')
-
 paper_list = []  # Add this line to initialize paper_list as an empty list
 
 main_body = [pn.pane.LaTeX("Please select some tags!", styles={'font-size': '20pt'})]
 
 # Create buttons for the toggleable sidebar
-button1 = pn.widgets.Button(icon='home', name="Home", icon_size='1.5em', button_type = 'primary', button_style = 'outline', width = 140)
-button2 = pn.widgets.Button(icon='file-analytics', name='My papers', icon_size='1.5em', button_type = 'primary', button_style = 'outline', width = 140)
-button3 = pn.widgets.Button(icon='settings', icon_size='1.5em', name='Settings', button_type = 'primary', button_style = 'outline', width = 140)
+button1 = pn.widgets.Button(icon='home', name="Home", icon_size='1.5em', button_type='primary', button_style='outline', width=140)
+button2 = pn.widgets.Button(icon='file-analytics', name='My papers', icon_size='1.5em', button_type='primary', button_style='outline', width=140)
+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)
 
-select = CustomRadioButtonGroup(value="⭐", options=["⭐", "🐘"], name='String', align='center',button_type = 'success')
+    def _process_events(self, events):
+        changed = super()._process_events(events)
+        if "value" in changed:
+            self.value_change = True
+        return changed
+
+select = CustomRadioButtonGroup(value="⭐", options=["⭐", "🐘"], name='String', align='center')
 
 # Create a column layout for the buttons inside the toggleable sidebar
 buttons = pn.Column(
@@ -49,11 +52,9 @@ buttons = pn.Column(
 # Function to display the selected value
 def display_selected_value(event):
     print(f"Selected value: {select.value}")
-    
-select.param.watch(display_selected_value, 'value_change')
 
-# Attach the function to the RadioButtonGroup's on_change event
-select.on_change(display_selected_value)
+# Attach the function to the CustomRadioButtonGroup's value_change event
+select.param.watch(display_selected_value, 'value_change')
 
 # List to store the entered options
 loaded_list = TLDR.load_categories()