Bug 182000 Cross tab layout behavior
In the current approach of cross tab layout view, the arrow is associated with the first data item in the cell. - User cannot delete measure and level data items which have arrow with them. -Wenbin has concerns with the approach, as this will make the UI very restrictive. - Also user may want to delete data item and just show image in a cross tab cell. We had a discussion with Bang, and he has revised the mockups for the layout - The idea is that the arrow is associated with the cross tab cell and not data item. Let us know if there are any issues with supporting this.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/editparts/CrosstabGraphicsFactory.java
{
					return new MeasureHandleDataItemEditPart(model);
				}
			}
		}
		if ( model instanceof VirtualCrosstabCellAdapter )
		{
			return new VirtualCellEditPart( model );
		}
		if ( model instanceof CrosstabCellAdapter )
		{
			return new CrosstabCellEditPart( model );
		}
		return null;
	}
	
	private MenuManager createMenuManager(String position, EditPartViewer viewer)
	{
		if (ICrosstabCellAdapterFactory.CELL_FIRST_LEVEL_HANDLE.equals( position ))
		{
			return new LevelCrosstabPopMenuProvider(viewer);
		}
		if (ICrosstabCellAdapterFactory.CELL_MEASURE.equals( position ))
		{
			return new MeasureCrosstabPopMenuProvider(viewer);
		}
		throw new RuntimeException("Don't support this position");
	}
}