C#

using iTextSharp.text;
using iTextSharp.text.pdf;

Style(ControlStyles.UserPaint, true);

using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;

namespace MyControls
{
    public class MyDateTimePicker : DateTimePicker
    {
        public MyDateTimePicker()
            : base()
        {
            this.SetStyle(ControlStyles.UserPaint, true);
        }

        [Browsable(true),
        EditorBrowsable(EditorBrowsableState.Always),
        DefaultValue(typeof(Color), "Window")]
        public override Color BackColor
        {
            get { return base.BackColor; }
            set { base.BackColor = value; }
        }

        [Browsable(true),
        EditorBrowsable(EditorBrowsableState.Always),
        DefaultValue(typeof(Color), "WindowText")]
        public override Color ForeColor
        {
            get { return base.ForeColor; }
            set { base.ForeColor = value; }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            StringFormat stringFormat = new StringFormat();
            stringFormat.LineAlignment = StringAlignment.Center;
            using (Brush brush = new SolidBrush(BackColor))
            {
                e.Graphics.FillRectangle(brush, 0, 0, ClientRectangle.Width, ClientRectangle.Height);
            }
            using (Brush brush = new SolidBrush(ForeColor))
            {
                e.Graphics.DrawString(Text, Font, brush, ClientRectangle, stringFormat);
            }
            Rectangle dropDownRectangle = new Rectangle(
                ClientRectangle.Width - Height, 0, Height, Height);
            if (ComboBoxRenderer.IsSupported)
                ComboBoxRenderer.DrawDropDownButton(e.Graphics, dropDownRectangle, ComboBoxState.Normal);
            else
                ControlPaint.DrawComboButton(e.Graphics, dropDownRectangle, ButtonState.Normal);
        }
    }
}