[Duugu]

I'm again digging into this. Now with flyout buttons.

I've finally managed to set up a flyout button without using the type "action".

btn:SetAttribute("type", "flyout")
btn:SetAttribute("spell", <flyoutnumber>)

But ... I didn't found a way to support a pick up action for the button.
Right now I'm picking up the button via the flyout id and the PickupSpellBookItem.

local name = GetFlyoutInfo(value)
    local found
    local spellName = ""
    local i = 1
    while true do
       local spellName = GetSpellBookItemName(i, BOOKTYPE_SPELL)
        if spellName == name then
            found = i
            break
        end
       if not spellName then
          do break end
       end
       i = i + 1
    end
    
    if found then
        PickupSpellBookItem(found, BOOKTYPE_SPELL)
    end

But, well ... this is unsecure. Is there really no way to support dragging flyout buttons from the button frame without using "action" and an action id?