trigger enemies & stuff

[idontknow]

i'm confused about rooms that combine enemies & trigger enemies; if you have a room with like 3 stalfos for example (or any kind of normal enemy in general) and also a trigger enemy and then you check the "enemies-->secrets" and "enemies-->item" screen flags, will the item appear if you defeat all the normal enemies (but leaving behind the trigger enemy) but the secrets will not activate until that level's boss is defeated?...is that right?..or must i defeat the boss, which defeats the trigger enemy, in order to also get the item?..i'm a little unclear on exactly how trigger enemies work..i'm pretty sure that if you have the enemy--secrets flag checked, then the boss of that level must be defeated in order to uncover the secrets if a trigger enemy is placed in that same room...what about the enemy-->item flag?