How to add the Color for the top tool bar

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C#

Hi,
I like to add the color for the top toolbar for the HTMLEditor. But I dont know the syntax. Can any one help me to solve this problem. Here is the code:

public class CustomEditor : Editor
    {
        protected override void FillTopToolbar()
        {             
            Collection<ajaxcontroltoolkit.htmleditor.toolbarbutton.selectoption> options;
            AjaxControlToolkit.HTMLEditor.ToolbarButton.SelectOption option;
                       
            TopToolbar.Buttons.Add(new AjaxControlToolkit.HTMLEditor.ToolbarButton.Bold());
            TopToolbar.Buttons.Add(new AjaxControlToolkit.HTMLEditor.ToolbarButton.Italic());
            TopToolbar.Buttons.Add(new AjaxControlToolkit.HTMLEditor.ToolbarButton.Underline());
            TopToolbar.Buttons.Add(new AjaxControlToolkit.HTMLEditor.ToolbarButton.BulletedList());
            TopToolbar.Buttons.Add(new AjaxControlToolkit.HTMLEditor.ToolbarButton.OrderedList());
            TopToolbar.Buttons.Add(new AjaxControlToolkit.HTMLEditor.ToolbarButton.IncreaseIndent());        
            TopToolbar.Buttons.Add(new AjaxControlToolkit.HTMLEditor.ToolbarButton.DecreaseIndent()); 
}
}

Thanks in advance