Bug 183888 BIRT designer - Cube in data explorer
Current behavior - The data explorer view allows uer to change the order of a group level in a hierrachy. Expected behavior - user should not be allowed to change the order of the group level in data explorer view. - Instead user can user cube builder dialog to change the order.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
* 
	 * @param handle
	 *            the child of the table or grid
	 */
	public static Object getTableParent( DesignElementHandle handle )
	{
		while ( handle != null )
		{
			if ( handle instanceof TableHandle )
			{
				return ( (TableHandle) handle );
			}
			if ( handle instanceof GridHandle )
			{
				return ( (GridHandle) handle );
			}
			handle = handle.getContainer( );
		}
		return null;
	}
	/**
	 * Returns if all objects are in the same column
	 * 
	 * @param objs
	 *            the array of the object
	 */
	public static boolean isInSameColumn( Object[] objs )
	{
		assert objs != null && objs.length > 1;
		final class ColumnPosition