Ensure FloatPanel correctly exposes its children (#5433)

panel/layout/float.py

@@ -189,3 +189,23 @@ def __css__(cls):
 
     def __init__(self, *objects, name='', **params):
         super().__init__(objects=list(objects), name=name, **params)
+
+    def select(self, selector=None):
+        """
+        Iterates over the Viewable and any potential children in the
+        applying the Selector.
+
+        Arguments
+        ---------
+        selector: type or callable or None
+          The selector allows selecting a subset of Viewables by
+          declaring a type or callable function to filter by.
+
+        Returns
+        -------
+        viewables: list(Viewable)
+        """
+        objects = super().select(selector)
+        for obj in self:
+            objects += obj.select(selector)
+        return objects