function sendReport() {
SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Data").hideSheet();
SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Lists").hideSheet();
var message = {
to: SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Invoice').getRange(1,1),
subject: "Chroma Invoice",
body: "Please see your attached invoice!",
name: "Bob",
attachments: [SpreadsheetApp.getActiveSpreadsheet().getAs(MimeType.PDF).setName("Chroma Invoice")]
}
MailApp.sendEmail(message);
SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Data").activate();
SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Lists").activate();