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.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
groupHandle.getHeader( ).add( factory.newTableRow( columnCount ) );
			groupHandle.getFooter( ).add( factory.newTableRow( columnCount ) );
		}
		else if ( parent instanceof ListHandle )
		{
			groupHandle = factory.newListGroup( );
			slotHandle = ( (ListHandle) parent ).getGroups( );
		}
		if ( groupHandle != null && slotHandle != null )
		{
			slotHandle.add( groupHandle, position );
			
			{
				GroupDialog dialog = new GroupDialog( getDefaultShell( ),
						GroupDialog.GROUP_DLG_TITLE_NEW );
				
				dialog.setInput( groupHandle );
				if ( dialog.open( ) == Window.CANCEL )
				{
					return false;
				}
			}
			return true;
		}
		return false;
	}
	/**
	 * Gets the first selected edit part in layout editor. Whenever the user has
	 * deselected all edit parts, the contents edit part should be returned.
	 *