If you click on a line in a list, then it show it's highlighted, can i move that highlight true a alias? and if i can how do i do that?

It's part of your system colours i suspect, so you would have to go through .. right click desktop - properties/personalize > windows colours/appearance.

No, if i press a button i want the highligt to move ether to the next line or the previous line.

did -c dialog id line ?

To go down...

did -c dialog id $calc($did(dialog,id).sel + 1)

To go up...

did -c dialog id $calc($did(dialog,id).sel - 1)

ex:. of going down

did -c mirc 1 $calc($did(mirc,1).sel + 1)

mirc can be replaced with $dname if within the dialog event.