Bug 146159 [Regression]Changing font operation doesn't work other than the first time
Description: The first time changing operation can work well. However, Change it again, it won't work. Steps: 1.Insert lable/text to layout or master page 2.Change the font from serif to cursive, it works well 3.Change the font again Result: The action doesn't work Additional infor: build number:200606080632
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
{
					return dataSetHandle;
				}
			}
		}
		return dataSetHandle;
	}
	/**
	 * Get a container that is a ListingHandle that can hold dataset.
	 * 
	 * @param container
	 * @return
	 */
	public static ListingHandle getListingContainer(
			DesignElementHandle container )
	{
		for ( DesignElementHandle elementHandle = container; elementHandle != null; elementHandle = elementHandle
				.getContainer( ) )
		{
			if ( elementHandle instanceof ListingHandle )
			{
				return (ListingHandle) elementHandle;
			}
		}
		return null;
	}
	/**
	 * Add a binding column on the given element
	 * 
	 * @param handle