Bug 135497 Data Type is not correct when "Generate All" for Data item
Description: Create a sample datasource and dataset. Insert a data into layout, bind with the dataset.Click "Generate All" to get the Data Binding columns, but the displayed data type is not consistent with the actual one.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/palette/BasePaletteFactory.java
String text = AUTOTEXT_LABEL_PAGE
							+ "<value-of>pageNumber</value-of>"; 
					textHandle = factory.newTextItem( null );
					textHandle.setContentType( DesignChoiceConstants.TEXT_CONTENT_TYPE_HTML );
					textHandle.setContent( text );
					( (CellHandle) cellList.get( 1 ) ).getContent( )
							.add( textHandle );
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			else if ( IReportElementConstants.REPORT_ELEMENT_GRID.equals( type ) )
			{
				TableOptionDialog dlg = new TableOptionDialog( UIUtil.getDefaultShell( ),
						false );
				if ( dlg.open( ) == Window.OK
						&& dlg.getResult( ) instanceof int[] )
				{
					int[] data = (int[]) dlg.getResult( );
					grid = factory.newGridItem( null, data[1], data[0] );
				}
				else
				{
					return false;
				}
			}
			else
			{