Bug 145021 Enhance the agrregate on option in column binding dialog
1. Check if the expression is aggregate expression by data utility class. 2. If yes, the option is ?all? and group name list 3. if not, the option disabled (or set to none?) if the column binding is in detail row. If the column binding is in group row, the option is ?None? and group name list.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/InsertInLayoutUtil.java
&& newTarget.getContent( ).getCount( ) == 0;
				}
			}
			return false;
		}
		/**
		 * Returns new Label insert position in form of <code>CellHandle</code>
		 */
		public Object getInsertPosition( )
		{
			return newTarget;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.birt.report.designer.internal.ui.dnd.InsertInLayoutUtil.InsertInLayoutRule#insert()
		 */
		public void insert( Object object ) throws SemanticException
		{
			Assert.isTrue( object instanceof DesignElementHandle );
			newTarget.addElement( (DesignElementHandle) object,
					CellHandle.CONTENT_SLOT );
		}
	}
	/**
	 * 
	 * Rule for inserting multiple data into table, and populating adjacent
	 * cells
	 */
	static class MultiItemsExpandRule implements InsertInLayoutRule