PropertyGrid dropdown list not showing up

[nickdu088]

Steps:

1. Add a a PropertyGrid control in demo project frmGoToLine

2. Add a new class inside of frmGoToLine
   ` class Test
   {
   public string Name { get; set; }

        public bool IsTrue { get; set; }
   
        public Color Color { get; set; }
   
        public Font Font { get; set; }
    }`
   

3. Add propertyGrid1.SelectedObject = new Test(); in frmGoToLine constructor

Color, Boolean dropdown list not showing up but FontDialog pops up.