Add issue

Author: lukasmasuch

issues/gh-13646/app.py

@@ -0,0 +1,12 @@
+import streamlit as st
+
+class test_class:
+    def __init__(self, text, value):
+        self.text = text
+        self.valu = value
+
+elements = [
+    test_class("A", 1),
+    test_class("B", 2)
+]
+st.multiselect("Test", elements, format_func=lambda x: x.text)