diff --git a/Demo_Tabs.py b/Demo_Tabs.py
index 673c9307..142f42f2 100644
--- a/Demo_Tabs.py
+++ b/Demo_Tabs.py
@@ -8,9 +8,17 @@ else:
 tab1_layout =  [[sg.T('This is inside tab 1')]]
 
 tab2_layout = [[sg.T('This is inside tab 2')],
-               [sg.In(key='in')]]
+               [sg.In(key='_in2_')]]
 
-layout = [[sg.TabGroup([[sg.Tab('Tab 1', tab1_layout), sg.Tab('Tab 2', tab2_layout)]])],
+tab3_layout = [[sg.T('This is inside tab 3')],
+               [sg.In(key='_in3_')]]
+
+tab4_layout = [[sg.T('This is inside tab 4')],
+               [sg.In(key='_in4_')]]
+
+
+layout = [[sg.TabGroup([[sg.Tab('Tab 1', tab1_layout, key='_mykey_'), sg.Tab('Tab 2', tab2_layout)]], key='_group2_', background_color='green', tab_location='top')],
+[sg.TabGroup([[sg.Tab('Tab 3', tab3_layout, key='_mykey_'), sg.Tab('Tab 4', tab4_layout)]], key='_group1_', tab_location='right')],
           [sg.RButton('Read')]]
 
 window = sg.Window('My window with tabs', default_element_size=(12,1)).Layout(layout)
diff --git a/PySimpleGUI.py b/PySimpleGUI.py
index 6cfef052..effff60c 100644
--- a/PySimpleGUI.py
+++ b/PySimpleGUI.py
@@ -3397,21 +3397,22 @@ def PackFormIntoFrame(form, containing_frame, toplevel_form):
 
                 if element.TabLocation is not None:
                     style = ttk.Style(tk_row_frame)
+                    custom_style = str(element.Key)+'customtab.TNotebook'
                     if element.TabLocation == 'left':
-                        style.configure('customtab.TNotebook', tabposition='ws')
+                        style.configure(custom_style, tabposition='ws')
                     elif element.TabLocation == 'right':
-                        style.configure('customtab.TNotebook', tabposition='es')
-                    elif element.TabLocation == 'top':
-                        style.configure('customtab.TNotebook', tabposition='nw')
+                        style.configure(custom_style, tabposition='es')
                     elif element.TabLocation == 'bottom':
-                        style.configure('customtab.TNotebook', tabposition='sw')
+                        style.configure(custom_style, tabposition='sw')
+                    else:
+                        style.configure(custom_style, tabposition='nw')
 
-                    element.TKNotebook = ttk.Notebook(tk_row_frame, style='customtab.TNotebook')
+                    element.TKNotebook = ttk.Notebook(tk_row_frame, style=custom_style)
                 else:
                     element.TKNotebook = ttk.Notebook(tk_row_frame)
 
                 if element.BackgroundColor is not None and element.BackgroundColor != COLOR_SYSTEM_DEFAULT:
-                    ttk.Style().configure("TNotebook", background=element.BackgroundColor)
+                    ttk.Style().configure(str(element.Key)+'customtab.TNotebook', background=element.BackgroundColor)
 
 
                 PackFormIntoFrame(element, toplevel_form.TKroot, toplevel_form)