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
{
		if ( selection instanceof StructuredSelection )
		{
			return handleValidateDragInOutline( ( (StructuredSelection) selection ).toArray( ) );
		}
		if ( selection instanceof Object[] )
		{
			Object[] array = (Object[]) selection;
			if ( array.length == 0 )
			{
				return false;
			}
			if ( array[0] instanceof ColumnHandle
					&& ( (ColumnHandle) array[0] ).getRoot( ) != null )
			{
				boolean bool = false;
				int columnNumber = HandleAdapterFactory.getInstance( )
						.getColumnHandleAdapter( array[0] )
						.getColumnNumber( );
				Object parent = ( (ColumnHandle) array[0] ).getContainer( );
				if ( parent instanceof TableHandle )
				{
					bool = ( (TableHandle) parent ).canCopyColumn( columnNumber );
				}
				else if ( parent instanceof GridHandle )
				{
					bool = ( (GridHandle) parent ).canCopyColumn( columnNumber );
				}
				if ( bool && array.length == 1 )
				{