How can I implement graphic shapes as Selectable, property changable on mouse events. Trying to make paint like program with objects modifying feature. Please suggest.

public abstract class Shape
    {
        //Fields
        private const int BORDER_WIDTH = 5;
        private bool _showBorder = true;
        private Color _color;
        private Point _location;
        public Control _BaseCanvas;
        private bool _isSelected;
        

        //Properties
        public bool IsSelected
        {
            get { return _isSelected; }
            set { _isSelected = value; }
        }
        public float BorderWidth
        {
            get { return BORDER_WIDTH; }
        }
        public bool ShowBorder
        {
            get { return _showBorder; }
            set { _showBorder = value; }
        }
        public Color Color
        {
            get { return _color; }
            set { _color = value; }
        }
        public int Xposition
        {
            get { return _location.X; }
            set { _location.X = value; }
        }
        public int Yposition
        {
            get { return _location.Y; }
            set { _location.Y = value; }
        }
        public Point Location
        {
            get { return _location; }
            set { _location = value; }
        }

        public static Shape self;

        /// <summary>
        /// Default Constructor 
        /// </summary>
        public Shape(Control refCanvas)
        {
            _BaseCanvas = refCanvas;
            _color = Color.Black;
            self = this;
        }

        /// <summary>
        /// Constructor with Position
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        public Shape(Control refCanvas, Point location) : this(refCanvas)
        {
            _location = location;
        }

        public abstract void Draw();
       // public abstract void Paint();
    }

//Inherits form Base Class Shape
    class Square : Shape
    {
        // Protected field members
        protected int _size;

        //Public Properties
        public int Size
        {
            get { return _size; }
            set { _size = value; }
        }

        /// <summary>
        /// Constructor with base form initialization
        /// </summary>
        /// <param name="ContainerForm"></param>
        public Square(Control objControl) : base(objControl) { }
        public Square(Control objControl, Point location) : base(objControl, location) { }

        /// <summary>
        /// Function to draw Square
        /// </summary>
        public override void Draw()
        {
            Graphics g = _BaseCanvas.CreateGraphics();
            Pen p = new Pen(Color);
            p.Width = BorderWidth;
            g.DrawRectangle(p, Xposition, Yposition, _size, _size);
        }

    }