Ok thank you very much !
Repeater + wix-animation would be a lot of work
it’s frutstrating when i know the pro gallery graphically exactly does what i want out of the box and is supposed to expand with the function expand()
I did not choose wix to have a lot of work 
I can confirm this must be a bug / limitation because :
$w . onReady ( function () {
console . log ( $w ( “#gallery1” ). collapsed );
$w ( “#gallery1” ). collapse ();
console . log ( $w ( “#gallery1” ). collapsed );
$w ( “#gallery1” ). expand ();
console . log ( $w ( “#gallery1” ). collapsed );
})
returns :
false
true
false
- nothing happens
and i expected / it should be :
true
true
false
- finally fire the nice expanded view !
thank you for time and your help
i stop searching for a solution