Hi boris.

Thank you for your help,we solved the issue by using your example,Thanks for Support.

Thanks&Regards,

Vinay

Hello,

I am just checking about the progress of this issue. Please let me know If you need my further assistance on this. 

Hello Vinay,

There is another method for that and this time I attached my sample in case we want to actually discuss and work on something. Please review it and feel free to let me know if I misunderstood you or if you have any other questions.

Hi Boris,

I worked out with your class,it works fine but we have to use a custom icon in the place of "SystemIcons.Asterisk" and "SystemIcons.Exclamation".So could you please tell me the using of custom icons in the place of SystemIcons.

Thanks&Regards,

Vinay.

Hello Vinay,

Could you please try to assign the following 'DrawFilter' to the 'WinTree' and see if it meets your requirements:

class DF : IUIElementDrawFilter
    {
        public bool DrawElement(DrawPhase drawPhase, ref UIElementDrawParams drawParams)
        {
            drawParams.Element.Rect = drawParams.Element.Parent.Rect;
            if (((ExpansionIndicatorUIElement)drawParams.Element).IsOpen)
                drawParams.Graphics.DrawIcon(SystemIcons.Asterisk, drawParams.Element.Rect);
            else
                drawParams.Graphics.DrawIcon(SystemIcons.Exclamation, drawParams.Element.Rect);
             return true;

        }

        public DrawPhase GetPhasesToFilter(ref UIElementDrawParams drawParams)
        {
            if (drawParams.Element is ExpansionIndicatorUIElement)
                return DrawPhase.BeforeDrawElement;

            return DrawPhase.None;
        }
    }

Please feel free to let me know if I misunderstood you or if you have any other questions.