To ku knizniciam delphi nie je ziadny reference manual ze sa pyta furt kazdy take veci?

http://www.delphibasics.co.uk/Article.asp?Name=Stan dard
procedure TForm1.ListBox1Click(Sender: TObject);
var
listBox : TListBox;
index : Integer;
begin
// Cast the passed object to its correct type
listBox := TListBox(Sender);

// Get the index of the selected list item
index := listBox.ItemIndex;

// Display the selected list item value
ShowMessage(listBox.Items[index]);
end;