LCD TV Resolutions.

Sometime ago I found I couldn't display a 1280x768 resolution on my LCD TV. Which I thought it should display after some monumental digging I have discovered the following from the manual (not online manual) :
WXGA - 1280x768
PC Monitor support (XGA) - 1024x768.

I always thought if something was WXGA I could display my screen widescreen or am I just being naive about something to do with technology. Could someone in the know give any possible explanation, or should I just shout at the company alot.

Will be more to do with the type of input you`re giving it.
IE what you connect it to on the set.
Should be a spec per input.