Using a callback function which accesses two handles

Hello, here is the problem: my function creates two figures. The first figure contains a radio button, which callback function I would like to access both figures' data.

The code is something like this:

h=figure(...'tag',h);

parametres = uipanel(..);

h2=figure(...'tag',h2);
    uicontrol('Parent',parametres,'Style','radiobutton','String','Pa','Units','pixels','Position',[240 95 120 15],'BackgroundColor','white','tag','bouton_Pa','Callback',@bouton_Pa_Callback,'KeyPressFcn',@key_bouton_PaetdB);

The callback function is :

function bouton_Pa_Callback(hObject,event) 
      %I tried using h2 as an input for the function, like (hObject,event,h2), didn't work

handles = guidata(gcbf);

handles2 = guidata(h2); % *This is where I get an error*

Apparently, gcbf can get the handle of the figure the button is located in (h), but if I try to get the data from h2 (which I believe to be the handle of the second figure), I get:

Undefined function or variable 'h2'.

How can I access the handle of a figure when I'm coding inside the callback function of a button located in another figure? I read that you could store and retrieve data from the GUI with getappdata and setappdata, but that would require me to "manually" create a variable containing all the figures' data, which is exactly what guidata is supposed to do, no?

Thanks :)

Answer 1

[per isakson]

A problems is that there are so many different ways.

One way is to use the property Tag in combination with findobj. Thus

    the_other_figure_handle = findobj( 0, 'Type','Figure'      ...
                                        , 'Tag' ,'a_good_name' );

[Pascal]

Thanks, it works.

Would declaring all the handles as global variables have helped?

[per isakson]

Yes, but don't make it a habit to use globals. I guess, globals and the tag-findobj approach are ok only with small programs.

[Pascal]

In that case, what solution would you have recommended for large programs dealing with multiple GUI figures, in which the callback functions had to access a lot of data from different figures?