Event stack .....(from mouse or keyboard)

[Guic]

Hi,

I have a problem with my buttons on my application..
In fact, when i click much on a button to get an html page for example, i get it more than one time ...

So how can i disabled the button, and especially the command ?

my code don't do what i want :
bind .button <button-1>
{
.button configure -state disabled;
myproc;
.button configure -state normal;
}

Thx