Random randm = new Random();
            var height = gridmain.ActualHeight; 
            var width = gridmain.ActualWidth;
            
            double drandmw = randm.NextDouble() * width;            
            double drandmh = randm.NextDouble() * height;
            double buttonw = ((Button)sender).ActualWidth;
            double buttonh = ((Button)sender).ActualHeight;