waitForElementVisible(By.className("v-datefield"));
WebElement dateTextbox = $(DateFieldElement.class).first().findElement(
By.className("v-textfield"));
ButtonElement button = $(ButtonElement.class).first();
dateTextbox.sendKeys("01/01/01", Keys.TAB);
assertLogText("1. valueChange: value: 01/01/01, is valid: true");
button.click();
assertLogText("2. buttonClick: value: 01/01/01, is valid: true");
dateTextbox.sendKeys("lala", Keys.TAB);