change color of shape when mouse is hovered over it and spacebar pressed

If the mouse is over the shape and the user presses spacebar, i want the colour of the shape to change to a random color. Any help is greatly appreciated as im still learning, cheers.

Program.cs

if (SwinGame.KeyTyped(KeyCode.SpaceKey))
{
myShapes.SelectShapes(SwinGame.MousePosition());
}

Drawing.cs

i believe it is this part of the code that i need to change. Color is not changing the color of the shape like i hoped but im not sure what else to use, nothing i've tried seems to work.

    public void SelectShapes(Point2D pt)
    {
        foreach (Shape s in _shapes)
        {
            if (s.At(pt))
            {
                Color = SwinGame.RandomRGBColor(255);
            }
        }
    }

Shape.cs

using SwinGameSDK;

namespace ShapeGame
{
    public class Shape
    {
        public Color _color;
        private float _x, _y;
        private int _w, _h;
        private bool _selected;



        public bool At(Point2D pt)
        {
            return SwinGame.PointInRect(pt, _x, _y, _w, _h);
        }

        public Shape()
        {
            _color = Color.DarkRed;
            _x = 0;
            _y = 0;
            _w = 80;
            _h = 80;
        }



        public Color Color
        {
            get
            {
                return _color;
            }
            set
            {
                _color = value;
            }
        }

        public float X
        {
            get
            {
                return _x;
            }
            set
            {
                _x = value;
            }
        }

        public float Y
        {
            get
            {
                return _y;
            }
            set
            {
                _y = value;
            }
        }

        public int W
        {
            get
            {
                return _w;
            }
        }

        public int H
        {
            get
            {
                return _h;
            }
        }


        public void Draw()
        {
            if (_selected)
            {
                DrawOutline();
            }

            SwinGame.FillRectangle(_color, _x, _y, _w, _h);
        }