The following example shows how to determine if an object has a property available, and if so, how to change the property:

function HasProperty(Obj : TObject;
             Prop : string) : PPropInfo;
begin
  Result := GetPropInfo(Obj.ClassInfo, Prop);
end;
procedure TForm .Button Click(Sender: TObject);
var
  p : pointer;
begin
  p :=  HasProperty(Button , 'Color');
  if p <> nil then
    SetOrdProp(Button , p, clRed) else
    ShowMessage('Button has no color property');
  p :=  HasProperty(Label , 'Color');
  if p <> nil then
    SetOrdProp(Label , p, clRed) else
    ShowMessage('Label has no color property');
  p :=  HasProperty(Label .Font, 'Color');
  if p <> nil then
    SetOrdProp(Label .Font.Color, p, clBlue) else
    ShowMessage('Label.Font has no color property');
end;