Treeview make last child nodes collapsed by default

Question

Hi,

I would like to display the treeview only the last child nodes collapsed by default. So in this example I would like to collapse "T121" and "T122" nodes only. Could you please help with the syntax?

Regards..

T1
    T12
             T121
                      T1211
                      T1212
             T122
                     T1221
                     T1222   
    T13