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Python Custom Tkinter. Hover effect on buttons when selected with Tabulator key

So I have used .bind() on all my buttons and basically I would like to see which button is currently 'selected' when I switch between them with tabulator key. I did spend already quite a while on search for solution but didn't found anything useful. I don't know how to grab that moment when after pressing Tab key focus is on a button.
When there is more widgets I can .bind() Tab key to a widget proceeding button to simply just change foreground of a button but this won't work in case when I have only buttons in frame because first button will be omitted and that's not a clean and right solution to my issue.
If I bind Tab key to that button and change foreground then it's changed but after pressing Tab when button was already selected.
I don't know is there any clean solution for that problem or I will have to for frames that have only buttons create some starting_dummy widget that would initiate change for a first button.

Haven't found a way to detect is Tab key focused at this moment on a particular button (like it is with hover and cursor) but I know when it's going to be so I used that and solved case with only buttons in frame. It's based on what I already wrote in the question - I'm binding Tab key with a function to a widget preceding button to change button colour while button is bind to a function that's changing colour back to normal like this:
self.entry.bind("<Tab>", self.focus_in)
self.button.bind('<Tab>', self.focus_out)
def focus_in(self, event):
self.button.configure(fg_color='white')
def focus_out(self, event):
self.button.configure(fg_color='black')
For the case when only widgets in the frame/root are buttons, like in a menu that I got first I focus_set() on the last button and make a functions that circulate colours on and off at on Tab like this:
self.button2.focus_set()
self.button1.bind('<Tab>', self.focus_in)
self.button2.bind('<Tab>', self.focus_out)
def focus_out(self, event):
self.button1.configure(fg_color='white')
self.button2.configure(fg_color='black')
def focus_in(self, event):
self.button1.configure(fg_color='black')
self.button2.configure(fg_color='white')
Whit a custom made buttons it's just matter of replacing fg_color with a image.
If you use a button as an image holder for your logo or so, then just set state='disabled' and it will be omitted.

tkinter Button widget 'inside' another button widget-tkinter

I need to make an application, in which I need to place a tkinter button widget-'b1', inside another tkinter button widget-'b2'.
b2,however disappears and appears only after mouse is hovered over it.
Made a simple code without using OOP. Firstly made a master root window,added button 'b1'. Then using 'b1' as a master, added button 'b2'. The callbacks of both buttons are different. The problem is,button 1(in light blue color) appears normally visible. However second button(in red color) doesnt gets displayed. It appears only when you hover the mouse over it.
import tkinter as tk
root=tk.Tk()
b1=tk.Button(root,height=7,width=10,bg='light blue',command=print('B1'))
b1.place(x=0,y=0)
b2=tk.Button(b1,height=3,width=5,bg='red',command=print('B2'))
b2.place(x=2,y=2)
root.update()
Is it possible that both buttons are displayed simultaneously?.
Help is appreciated. Thanks in advance
This version of code is just for simplification. Later will implement more buttons and OOP as well. Sorry for mistakes if any.

Is there a way to make an invisible button in Tkinter?

I found ways to hide something after pressing a button, but what I would like to do is having an invisible button that can still be pushed. A secret button of some sort, using Tkinter. It doesn't need to do anything yet

You don't need an invisible button to register a secret click Simply bind <1> to the root window and it will register whenever you click on anything (unless you click on some other widget that is listening for that event). You can then check the coordinates of the click to see where the use clicked.

How to change my wx.toolbar event?

I have a wx.toolbar with some buttons. One of the buttons makes pan left!
I want to click on the button and while I keep it pressed, the pan left is made.
For now I only saw that the wx.EVT_TOOL only works when mouse left is up.
Is there a way to do what I intend ?

In the toolbar button's event, you should be able to get the state of the mouse via wx.GetMouseState.
Alternatively, you can make your own toolbar with a panel and some wx.Buttons (or other button widgets).

Selecting Widgets

In Tkinter I'm trying to make it so when a command is run a widget is automatically selected, so that a one may bind events to the newly selected widget.
Basically I want it so when I press a button a text widget appears. When it appears normally one would have to click the text widget to facilitate the running of events bound to the text widget. I want that behavior to automatically happen when the user clicks the button. So that one does not have to click the button and then the text widget, but simply the button.
I'd also like it so if one started typing after the button was pressed it would automatically start filling the text widget. Again to cut out having to click on the text widget.
What bit of code does the above?

The terminology which describes what you want is "focus" -- you want to set the keyboard focus to your text widget. To do that you need to use the focus_set() and/or focus_force() methods on the text widget.