Trocar a seta no JComboBox ou Tabela UIDefaults

protected JButton createArrowButton()
			{
				return new MyBasicArrowButton(BasicArrowButton.SOUTH,
					UIManager.getColor("ComboBox.buttonBackground"),
					UIManager.getColor("ComboBox.buttonShadow"),
					UIManager.getColor("ComboBox.buttonDarkShadow"),
					UIManager.getColor("ComboBox.buttonHighlight"));
			}

class MyBasicArrowButton extends BasicArrowButton
{
	public MyBasicArrowButton(int direction)
	{
		super(direction);
	}
	
	public MyBasicArrowButton(int direction, Color background, Color shadow, Color darkShadow, Color highlight)
	{
		super(direction, background, shadow, darkShadow, highlight);
		setBackground(Color.black);
	}
	
	public void paintTriangle(Graphics g, int x, int y, int size, int direction, boolean isEnabled)
	{
		Color oldColor = g.getColor();
		int mid, i, j;
		j=0;
		size = Math.max(size, 2);
		mid = (size/2) - 1;
		g.translate(x, y);
		g.setColor(Color.green);
		j = 0;
		for(i = size-1; i >= 0; i--)
		{
			g.drawLine(mid-i, j, mid+i, j);
			j++;
		}
		g.translate(-x, -y);
		g.setColor(oldColor);
	}
}