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THTMLTreeView
How to have all Child items checked or unchecked depending on the parent check state

This is a code snippet that demonstrates this applied to a default THTMLTreeView on the form: 
procedure TForm4.FormCreate(Sender: TObject);
 var
  tn,sn: TTreeNode;

begin
  tn := htmltreeview1.Items.Add(nil,'Parent node');
  htmltreeview1.SetNodeCheck(tn, false);

  sn := htmltreeview1.Items.AddChild(tn,'Child 1');
  htmltreeview1.SetNodeCheck(sn, false);
  sn := htmltreeview1.Items.AddChild(tn,'Child 2');
  htmltreeview1.SetNodeCheck(sn, false);
  sn := htmltreeview1.Items.AddChild(tn,'Child 3');
  htmltreeview1.SetNodeCheck(sn, false);

  tn := htmltreeview1.Items.Add(nil,'Parent node');
  htmltreeview1.SetNodeCheck(tn, false);

end;

procedure TForm4.HTMLTreeview1CheckBoxClick(Sender: TObject; Node: TTreeNode; Check: Boolean);
var
  i: integer;
  sn: TTreeNode;
begin
  sn := Node.getFirstChild;

  while assigned(sn) do
  begin
    Htmltreeview1.SetNodeCheck(sn,check);
    sn :=sn.getNextSibling;
  end;
end;
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