Regarding accessing single widgets on a window

[Jyothi <jyothi ncoretech com>]

Hi,

    I have a window and that I have several widgets like button, label ,
entry box.  I have to write an API which has to take the reference of
the label widget , hide that widget and show menu bar in the place of
label... Since this should a common API, I cannot pass the
reference of the label widget to this, neither can make the label widget
global..... So how do I get the ID of individual widgets in a
window.....

Thanks in Advance,
Jyothi.