Cannot find wxGUI libraries in the GRC Blocks


I am using the USRP N210 and running the same application as described
in the ettus website/youtube:

“How To Build an FM Receiver with the USRP in Less Than 10 Minutes”

I noticed in my GRC I don’t see some of the blocks that they have used
in the video, such as WX GUI Text box, WX GUI FFT Sink,
WX_GUI_notebook. I am using GNU Radio Companion

I have attached a snapshot, showing all the blocks that are available
to generate a flowgraph. Please let me know how to enable the blocks
that are not available currently in my GRC.

I am using windows 7 64 bit OS.