[Vala] signal row-activated

[Arley Consuegra Rosello <aconsuegra uci cu>]

Hello, I'm testing the GtkTreeView but the signal row-activated don't
want work, the program says "segmentation fails"

below the code of the fuction that must be called by the signal
row-activated 

_datosRepo is a TreeStore
.
.
.
[CCode (instance_pos = -1)]
  protected void desplegar_arbol(TreePath ruta, TreeViewColumn columna){
  
  TreeIter  iterador;
  if(this._datosRepo.get_iter(out iterador,ruta))
  stdout.printf("selecionado\n");

}
.
.
.

pd: Spanish user