The user has pressed a preset flash whilst in the store menu. Try and record the group to that handle
Namespace: Group.StoreMenu
Void StoreGroupOnPresetButton(System.String, Int32, Avolites.Acw.Titan.AcwUserNumber)
http://[ip]:4430/titan/script/Group/StoreMenu/StoreOnButton
group: Button group
index: Index into that group
userNumber: The user number of the group to store