winMain.addComponentListener(new ComponentListener(){

            @Override
            public void componentResized(ComponentEvent e) {
                //Resize the form to make the dimensions a multiple of 20
                int newX = winMain.getWidth() % 20 == 0 ? winMain.getWidth() : winMain.getWidth() + (20 - winMain.getWidth() % 20);
                int newY = winMain.getHeight() % 20 == 0 ? winMain.getHeight() : winMain.getHeight() + (20 - winMain.getHeight() % 20);
                winMain.setSize(newX, newY);

            }

            @Override
            public void componentHidden(ComponentEvent e) {
                // TODO Auto-generated method stub

            }

            @Override
            public void componentMoved(ComponentEvent e) {
                // TODO Auto-generated method stub

            }

            @Override
            public void componentShown(ComponentEvent e) {
                // TODO Auto-generated method stub

            }

        });