sub new 
{ ....
  $self = {parentWnd=> $args{parentWnd};
}
sub initGui
{
  # creates other attributes as 
  $self->{tree} = ...
}
sub populateGui { ...} 

sub changeGui
{
## changeGui is getting invoked from Server::initServer()
## but $self->{tree} coming as undefined but before forking ## these two process Dumper($self) is having the expected ##hash structure


}
1;