Dotted Focus around the checkbox | Infragistics Forums

For the next one looking for the complete solution, here it is

public partial class MyCheckEditor : UltraCheckEditor
    {
        private const int PenWidth = 1;

        public MyCheckEditor()
        {
            InitializeComponent();
            if (!DesignMode)
            {
                CreationFilter = new FocusCreationFilter();
                DrawFilter = new FocusDrawFilter();
            }
        }

        private class FocusDrawFilter : IUIElementDrawFilter
        {
            private bool _wasMyCheckEditorMoved;

            DrawPhase IUIElementDrawFilter.GetPhasesToFilter(ref UIElementDrawParams drawParams)
            {
                if (drawParams.Element is UltraCheckControlUIElement)
                {
                    return DrawPhase.BeforeDrawElement;
                }
                if (drawParams.Element is CheckIndicatorUIElement)
                {
                    return DrawPhase.BeforeDrawElement;
                }
                return DrawPhase.None;
            }

            bool IUIElementDrawFilter.DrawElement(DrawPhase drawPhase, ref UIElementDrawParams drawParams)
            {
                if (drawParams.Element is UltraCheckControlUIElement)
                {
                    // move the UltraCheckEditor to the left for the same number of pixels
                    // as the width of the pen because we moved every child element
                    // to leave enough space to draw the left side of the focus rectangle
                    if(!_wasMyCheckEditorMoved)
                    {
                        Control control = drawParams.ControlElement.Control;
                        control.Size = new Size(control.Width + PenWidth, control.Height);
                        control.Location = new Point(control.Location.X - PenWidth, control.Location.Y);
                        _wasMyCheckEditorMoved = true;
                    }
                }
                else if (drawParams.Element is CheckIndicatorUIElement)
                {
                    if (drawParams.ControlElement.Control.Focused &&
                        (drawParams.ControlElement.Control.Text == null
                        || drawParams.ControlElement.Control.Text.Trim() == string.Empty))
                    {
                        Rectangle elementRect = drawParams.Element.Rect;
                        Pen pen = new Pen(Color.Black, PenWidth);
                        pen.DashStyle = DashStyle.Dot;
                        //draw the focus rectangle outside the checkbox
                        drawParams.Graphics.DrawRectangle(pen, elementRect.X - PenWidth, elementRect.Y - PenWidth, elementRect.Width + PenWidth, elementRect.Height + PenWidth);
                        return false;
                    }
                }
                return false;
            }
        }

        private class FocusCreationFilter : IUIElementCreationFilter
        {
            #region Implementation of IUIElementCreationFilter

            bool IUIElementCreationFilter.BeforeCreateChildElements(UIElement parent)
            {
                return false;
            }

            void IUIElementCreationFilter.AfterCreateChildElements(UIElement parent)
            {
                if (parent is CheckEditorCheckBoxUIElement)
                {
                    // move every child element to the right for the same number of pixels
                    // as the width of the pen to leave enough space to draw the left side of
                    // the focus rectangle
                    foreach (var element in parent.ChildElements)
                    {
                        element.Rect = new Rectangle(element.Rect.X + PenWidth, element.Rect.Y, element.Rect.Width, element.Rect.Height);
                    }
                }
            }
            #endregion
        }
    }