Bug 136270 Group's data binding column can only be used by the group itself
If you add some data binding columns to a group, these columns can only be used by this group itself. It should has a way to make the child can use the parent group's data binding column.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
}
	/**
	 * Converts an Integer value to an RGB object value, the Integer format is
	 * 0xRRGGBB.
	 * 
	 * @param rgbValue
	 *            Integer value.
	 * @return RGB value.
	 */
	public static RGB getRGBValue( int rgbValue )
	{
		if ( rgbValue == -1 )
		{
			return null;
		}
		return new RGB( ( rgbValue >> 16 ) & 0xff,
				( rgbValue >> 8 ) & 0xff,
				rgbValue & 0xff );
	}
	/**
	 * Converts an RGB object value to an Integer value, the Integer format is
	 * 0xRRGGBB.
	 * 
	 * @param rgb
	 *            RGB value.
	 * @return Integer value.
	 */
	public static int getRGBInt( RGB rgb )
	{
		if ( rgb == null )