I have a xml file and I want to find out where the tag data is being used in
the application.
All I see under the search menu in Flex builder is References and Declarations.
And both returns nothing when I search for the tag string being used any where
in the application.
Also why is there no simple file or string search for the whole project in
Flex Builder?
I find it very inconvenient to work with flex builder.

Can any one tell me how to do a simple string search that will search the
entire project?

I'm not set up to test right now (whether or not it works on file refs or just
class/script names) but hover over the code segment and if it pops up a tooltip
showing the locatoin or class associated with the snippet, press F3 and it
should take you to the reference.

As far as searching the whole project, use Control-Shift-F