Here is a little script I threw together to find where a used item is in the timeline. You first have to right-click the item in the media pool and choose "select timeline events".

Use this script- then hit the "\" key to center your window. Note it will only move to the first selected item, so if it is in more than once it won't go to the second. If nothing is selected it dies as I didn't do any error checking.

import System.Windows.Forms;
import Sony.Vegas;
var evnt = FindSelectedEvent();
Vegas.Cursor = evnt.Start;

// finds the first selected event... note that when multiple events
// are selected, this only returns the first. returns null if no
// events are selected.
function FindSelectedEvent() : TrackEvent {
var trackEnum = new Enumerator(Vegas.Project.Tracks);
while (!trackEnum.atEnd()) {
var track : Track = Track(trackEnum.item());
var eventEnum = new Enumerator(track.Events);
while (!eventEnum.atEnd()) {
var evnt : TrackEvent = TrackEvent(eventEnum.item());
if (evnt.Selected) {
return evnt;
}
eventEnum.moveNext();
}
trackEnum.moveNext();
}
return null;
}