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/MeasureCrosstabPopMenuProvider.java
}
		Object firstSelectedElement = getFirstElement( );
		if ( firstSelectedElement instanceof DesignElementHandle )
		{					
			IAction action = new AddMesureViewHandleAction( (DesignElementHandle) firstSelectedElement);
			menu.add( action );
			
			action = new DeleteMeasureHandleAction( (DesignElementHandle) firstSelectedElement);
			menu.add( action );
		}
	}
	/**
	 * Gets the current selection.
	 * 
	 * @return The current selection
	 */
	protected ISelection getSelection( )
	{
		return getViewer( ).getSelection( );
	}
	/**
	 * Gets element handles.
	 * 
	 * @return element handles
	 */
	protected List getElements( )
	{
		return InsertInLayoutUtil.editPart2Model( getSelection( ) ).toList( );
	}
	/**