Get handle of a GUI to resize operation

Hi all, i have a GUI to resize, because in some different resolutions i get overlapping static text; so i found that the correct syntax to get an automatic resize should be (correct if i'm wrong):

scrsz = get(0,'ScreenSize');
set(%GUI handle here,'position', [(scrsz(3)-300)/2 (scrsz(4)-600)/2 800 700])

The problem is, how to get the figure handle? i can't use gcf because it's not the main GUI, but a second one opened in order to set some parameters, so if i use gcf it just get the main GUI handle. Thanks everyone!

[Geoff Hayes]

Alessandro - have you used GUIDE to create your GUI, or have you created it programmatically? If the former, then you can access the handle to your GUI using the handles structure, typically as

 handles.figure1