From: Mike Hall <mghall@...>
Date: 2002-04-26T06:56:40+09:00
Subject: Re: Minor Tk bug on Windows?

"Hal E. Fulton" wrote:

> A TkButton can take the focus when you press
> the tab key (as you'd expect), but pressing
> Enter then does not activate the button.

> Apparently the only way to press a TkButton is
> to use the mouse...

No.

> Can anyone confirm/deny?

Yes.

From the Tcl/Tk "button" manual page:

 
  DEFAULT BINDINGS
       Tk  automatically  creates class bindings for buttons that
       give them default behavior:
 
       [1]    A button activates whenever the mouse  passes  over
              it  and  deactivates  whenever the mouse leaves the
              button.  Under Windows, this binding is only active |
              when  mouse button 1 has been pressed over the but� |
              ton.
 
       [2]    A button's relief is  changed  to  sunken  whenever
              mouse  button 1 is pressed over the button, and the
              relief is restored to its original value when  but�
              ton 1 is later released.
 
       [3]    If  mouse  button  1  is  pressed over a button and
              later released  over  the  button,  the  button  is
              invoked.   However,  if  the  mouse is not over the
              button when button 1 is released, then  no  invoca�
              tion occurs.
 
>>>>   [4]    When  a  button  has the input focus, the space key
              causes the button to be invoked.

       If the button's state is disabled then none of  the  above
       actions occur:  the button is completely non-responsive.
 
       The  behavior  of  buttons  can be changed by defining new
       bindings for individual widgets or by redefining the class
       bindings.


Works as advertised.
Use a 'bind' to augment it.

--
Mike Hall
http://www.enteract.com/~mghall