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/CrosstabCellEditPart.java
boolean hasCell = false;
					boolean hasOther = false;
					for ( int i = 0; i < size; i++ )
					{
						if ( editparts.get( i ) instanceof CrosstabCellEditPart )
						{
							hasCell = true;
						}
						else
						{
							hasOther = true;
						}
					}
					if ( hasCell && hasOther )
					{
						for ( int i = 0; i < size; i++ )
						{
							if ( editparts.get( i ) instanceof CrosstabCellEditPart )
							{
								copy.remove( editparts.get( i ) );
							}
						}
					}
					editparts = copy;
					return editparts;
				}
			};
		}
		return super.getAdapter( key );
	}