Eclipse Replace text in all Classes?

I have tried the following option in Helios Version of Eclipse. Simply press CTRL+F you will get the "Find/Replace" Window on your screen

Press Ctrl+H or look in the Search menu for Search>Search or Search>File Search Tab. At bottom of dialog box, click Replace

Press Ctrl+H or look in the Search menu for Search>Search or Search>File depending on version. At bottom of dialog box, click Replace... There you'll find the replace in files functionality.