The user has pressed a preset flash whilst in the store menu. Try and record the group to that handle
Namespace: Group.StoreMenu
Void Group.StoreMenu.StoreOnButton(String group, Int32 index, AcwUserNumber userNumber)
http://[ip]:4430/titan/script/2/Group/StoreMenu/StoreOnButton?group={string}&index={titanId}&userNumber={userNumber}
group ( String ) : Button group
index ( Int32 ) : Index into that group
userNumber ( AcwUserNumber ) : The user number of the group to store