[flexcoders] Tree - Open all child layers when open branch

[nhid]

Hi,

I have this tree structure:

   Branch1
      ChildA
          Child1
              Child1.1
              Child1.2
                  Child1.2.1
          Child2
               Child2.1
                  Child2.1.1
                  Child2.1.2
              Child2.2
                  Child2.2.1

How can I open all the child layers at once when I click on the folder icon
of Branch1?

Thanks!