diff --git a/PySimpleGUI.py b/PySimpleGUI.py
index 5e9d3a52..9e7beb19 100644
--- a/PySimpleGUI.py
+++ b/PySimpleGUI.py
@@ -2406,7 +2406,7 @@ class ErrorElement(Element):
 # ------------------------------------------------------------------------- #
 class Window:
 
-    def __init__(self, title, default_element_size=DEFAULT_ELEMENT_SIZE, default_button_element_size = (None, None), auto_size_text=None, auto_size_buttons=None, location=(None, None), button_color=None, font=None, progress_bar_color=(None, None), background_color=None, border_depth=None, auto_close=False, auto_close_duration=DEFAULT_AUTOCLOSE_TIME, icon=DEFAULT_WINDOW_ICON, force_toplevel = False, return_keyboard_events=False, use_default_focus=True, text_justification=None, no_titlebar=False, grab_anywhere=False, keep_on_top=False, resizable=False):
+    def __init__(self, title, default_element_size=DEFAULT_ELEMENT_SIZE, default_button_element_size = (None, None), auto_size_text=None, auto_size_buttons=None, location=(None, None), button_color=None, font=None, progress_bar_color=(None, None), background_color=None, border_depth=None, auto_close=False, auto_close_duration=DEFAULT_AUTOCLOSE_TIME, icon=DEFAULT_WINDOW_ICON, force_toplevel = False, alpha_channel=1, return_keyboard_events=False, use_default_focus=True, text_justification=None, no_titlebar=False, grab_anywhere=False, keep_on_top=False, resizable=False):
         '''
         Window
         :param title:
@@ -2472,7 +2472,7 @@ class Window:
         self.KeepOnTop = keep_on_top
         self.ForceTopLevel = force_toplevel
         self.Resizable = resizable
-        self.AlphaChannel = 255
+        self._AlphaChannel = alpha_channel
 
     # ------------------------- Add ONE Row to Form ------------------------- #
     def AddRow(self, *args):
@@ -2779,8 +2779,19 @@ class Window:
         :param alpha: From 0 to 1 with 0 being completely transparent
         :return:
         '''
+        self._AlphaChannel = alpha
         self.TKroot.attributes('-alpha', alpha)
 
+    @property
+    def AlphaChannel(self):
+        return self._AlphaChannel
+
+    @AlphaChannel.setter
+    def AlphaChannel(self, alpha):
+        self._AlphaChannel = alpha
+        self.TKroot.attributes('-alpha', alpha)
+
+
     def __enter__(self):
         return self
 
@@ -4052,7 +4063,7 @@ def StartupTK(my_flex_form):
     my_flex_form.SetIcon(my_flex_form.WindowIcon)
 
     try:
-        root.attributes('-alpha', 255)             # hide window while building it. makes for smoother 'paint'
+        root.attributes('-alpha', my_flex_form.AlphaChannel)             # Make window visible again
     except:
         pass