Callback function on window focus?

I created a figure with

f = figure

Is it possible to make something happen (callback) when the window containing my figure is selected ("on Focus")?

Answer 1

[Ajay Kumar]

f = figure;
drawnow
figure(f);

[Giuseppe Antonio]

I'm not asking how to give focus to the window but how to recognize that the user selected the window (i.e. detect window focus) and set a callback.

[Ajay Kumar]

what do you want to write in the callback? if the figure is selected?