public bool HideSelection {get; set;}

private void CreateMyGcColorPicker()
{
    // Create an instance of GcColorPicker control.
    GcColorPicker gcColorPicker = new GcColorPicker();

    // Initialize the Name and Location of the gcColorPicker.
    gcColorPicker.Name = "gcColorPicker";
    gcColorPicker.Location = new Point(10, 50);

    // Shows and sets the automatic color in the drop-down window.
    gcColorPicker.ShowAutomaticColor = true;
    gcColorPicker.AutomaticColor = SystemColors.WindowText;

    // Shows and sets the no-fill color in the drop-down window.
    gcColorPicker.ShowNoFillColor = true;
    gcColorPicker.NoFillColor = SystemColors.Window;

    // Remains hightlight the text of gcColorPicker when gcColorPicker lost focus.
    gcColorPicker.HideSelection = false;

    // Hightlight the text of gCcColorPicker when gcColorPicker gets focus.
    gcColorPicker.HighlightText = true;

    gcColorPicker.SelectedColorChanged += new EventHandler(GcColorPicker_SelectedColorChanged);

    // adds gcColorPicker to the form.
    this.Controls.Add(gcColorPicker);
}

// Change the button1's back color to the selected color of gcColorPicker.
private void GcColorPicker_SelectedColorChanged(object sender, EventArgs e)
{
    this.button1.BackColor = (sender as GcColorPicker).SelectedColor;
}