Made Window.metadata and SystemTray.metadata also properties

PySimpleGUI.py

@@ -7462,6 +7462,7 @@ class Window:
         :type metadata: (Any)
         """
 
+        self._metadata = None  # type: Any
         self.AutoSizeText = auto_size_text if auto_size_text is not None else DEFAULT_AUTOSIZE_TEXT
         self.AutoSizeButtons = auto_size_buttons if auto_size_buttons is not None else DEFAULT_AUTOSIZE_BUTTONS
         self.Title = str(title)
@@ -7620,6 +7621,26 @@ class Window:
         root.destroy()
         return screen_width, screen_height
 
+    @property
+    def metadata(self):
+        """
+        Metadata is available for all windows. You can set to any value.
+        :return: the current metadata value
+        :rtype: (Any)
+        """
+        return self._metadata
+
+
+    @metadata.setter
+    def metadata(self, value):
+        """
+        Metadata is available for all windows. You can set to any value.
+        :param value: Anything you want it to be
+        :type value: (Any)
+        """
+        self._metadata = value
+
+
     # ------------------------- Add ONE Row to Form ------------------------- #
     def add_row(self, *args):
         """
@@ -9573,6 +9594,7 @@ class SystemTray:
         :param metadata: User metadata that can be set to ANYTHING
         :type metadata: (Any)
         """
+        self._metadata = None
         self.Menu = menu
         self.TrayIcon = None
         self.Shown = False
@@ -9597,6 +9619,26 @@ class SystemTray:
 
         self.window['-IMAGE-'].bind('<Double-Button-1>', '+DOUBLE_CLICK')
 
+    @property
+    def metadata(self):
+        """
+        Metadata is an SystemTray property that you can use at any time to hold any value
+        :return: the current metadata value
+        :rtype: (Any)
+        """
+        return self._metadata
+
+
+    @metadata.setter
+    def metadata(self, value):
+        """
+        Metadata is an SystemTray property that you can use at any time to hold any value
+        :param value: Anything you want it to be
+        :type value: (Any)
+        """
+        self._metadata = value
+
+
 
     def read(self, timeout=None):
         """