Bug 193828 message should not be popped when adding group level to cross tab
In a cross tab click on an aggregation type data cell and select 'show/hide Group Levels'. If I want to add a level, A message dialog pops up. Expected: No message dialog should pop up when adding a level. The dialog should appear only when a level in unchecked.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/action/AddLevelHandleAction.java
{
		public int compare( Object o1, Object o2 )
		{
			LevelHandle handle1 = (LevelHandle)o1; 
			LevelHandle handle2 = (LevelHandle)o2;
			return handle1.getIndex( ) - handle2.getIndex( );
		}
		
	}
	
	private void insertLevelHandle(LevelHandle levelHandle, int pos ) throws SemanticException
	{
		CrosstabReportItemHandle reportHandle = viewHandle.getCrosstab( );
		
		
		ComputedColumn bindingColumn = CrosstabAdaptUtil.createComputedColumn( (ExtendedItemHandle) reportHandle.getModelHandle( ),
				levelHandle );
		ComputedColumnHandle bindingHandle = ((ExtendedItemHandle)reportHandle.getModelHandle( )).addColumnBinding( bindingColumn, false );
		
		LevelViewHandle levelViewHandle = viewHandle.insertLevel(levelHandle,pos );
		CrosstabCellHandle cellHandle = levelViewHandle.getCell( );
		
		DataItemHandle dataHandle = DesignElementFactory.getInstance( )
				.newDataItem( levelHandle.getName( ) );
		dataHandle.setResultSetColumn( bindingHandle.getName( ) );
		cellHandle.addContent( dataHandle );
	}
}