my $Child = $Window->{Client}->AddMDIChild (
      -name         => "Child".$ChildCount++,
      -title => $title,
      -onResize => \&ChildSize,
    ) or die "Child";

    $Child->AddGrid (
        -name    => "Grid",
        -pos     => [0, 0],
        -rows    => 50,
        -columns => 10,
        -fixedrows    => 1,
        -fixedcolumns => 1,
        -editable => 1,
    ) or die "new Grid";