Yes,

AfterDrawForegroung is sufficient,

thanx

You probably don't need to handle both phases for this. AfterDrawForeground is probably sufficient.

Thanx for quick reply, the following code works successfully:

public bool DrawElement(DrawPhase drawPhase, ref UIElementDrawParams drawParams)
        {
            if (drawParams.Element.GetType() == typeof(EditorWithComboDropDownButtonUIElement))
            {
                drawParams.Graphics.FillRectangle(SystemBrushes.Control, drawParams.Element.Rect);
                drawParams.Graphics.DrawImage(this.image, drawParams.Element.RectInsideBorders.Location);
            }
            return true;
        }

        public DrawPhase GetPhasesToFilter(ref UIElementDrawParams drawParams)
        {
            if (drawParams.Element.GetType() == typeof(EditorWithComboDropDownButtonUIElement))
            {
                return DrawPhase.BeforeDrawForeground | DrawPhase.AfterDrawForeground;
            }
            return DrawPhase.None;
        }

        private void OnLoad(object sender, EventArgs e)
        {
            this.uGMain.DrawFilter = this;
        }