how can colect this to one paket

Revision 2
hello
anyone can help me I'm make the desigin in the picture below how can send the decket wich his bytes split in combox and text and label my qustion is how can treated it as one pecket please i try to do this fro 2 month ago but no result
thank
the picture in this web site:
http://www.daniweb.com/software-development/vbnet/threads/444590/send-and-recieve-pakcet-to-xbee-using-vb.net[^]

please see the screen shot of my application here[^]

/Edit Image Link Added OP referring is added by Jibesh /Edit