Bug 136966 When set an alias on a column, the column can not be used in the cascading parameter
Description: When set an alias on a column, the column can not be used in the cascading parameter Steps to reproduce: 1. new a datasource and a dataset 2. set an alias on a column 3. new a cascading parameter, set the column with an alias as the values column Actual result: the column can not be used in the cascading parameter
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
selectedParameter.setFormat( format );
			}
			catch ( SemanticException e1 )
			{
				ExceptionHandler.handle( e1 );
			}
		}
	}
	private void doPreview( String pattern )
	{
		String type = getSelectedDataType( );
		String formatStr = ""; 
		if ( DesignChoiceConstants.PARAM_TYPE_STRING.equals( type ) )
		{
			formatStr = new StringFormatter( pattern, ULocale.getDefault( ) ).format( DEFAULT_PREVIEW_STRING );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_DATETIME.equals( type ) )
		{
			formatStr = new DateFormatter( pattern ).format( new Date( ) );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_DECIMAL.equals( type )
				|| DesignChoiceConstants.PARAM_TYPE_FLOAT.equals( type ) )
		{
			formatStr = new NumberFormatter( pattern ).format( DEFAULT_PREVIEW_NUMBER );
		}
		previewLable.setText( formatStr );
	}
	private String getCategroy( String formatString )
	{
		if ( formatString != null )