My Panasonic DMR-ES30V won't finalize my DVDs?

I have a Panasonic DVD Recorder...Model: DMR-ES30V which won't allow me to finalize a (just previiously recorded) DVD. After going through all the steps:
1 to 3 of "Disc Management", I can't bring up the
"Finalize" window. Instead I keep getting the "Format"
window.
Is there a solution to this issue?

Hank D
November 2009