Bug 204245 Blank column on visibility column in excel[0300]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLTableLayoutEmitter.java
{
				layout.resolveDropCells( createDropID( groupLevel, "all" ), finished ); 
			}
			else
			{
				layout.resolveDropCells( createDropID( groupLevel, "detail" ), finished ); 
			}
			hasDropCell = layout.hasDropCell( );
		}
	}
	
	protected static class LayoutEvent
	{
		final static int START_GROUP = 0;
		final static int START_BAND = 1;
		final static int END_GROUP = 2;
		final static int END_BAND = 3;
		final static int ON_ROW = 4;
		final static int ON_FIRST_DROP_CELL = 5;
		
		LayoutEvent(int type, Object value )
		{
			this.eventType= type;
			this.value = value;
		}
		int eventType;
		Object value;
	}
	
	protected static class StartInfo