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    selenium.getDriver().findElement(By.id("s2id_customFilter")).sendKeys(Keys.ARROW_DOWN);

Am using the above code but it's not working."s2id_customFilter" is the id of the drop down.Am clicking on the id and sending keys but there's no action from selenium.

My code:

    jQueryWebElement filterElement = selenium.jQuery("#s2id_customFilter");
    selenium.jQuery(".select2-choice",filterElement).click();
    JOptionPane.showMessageDialog(null, "one");
    selenium.getDriver().findElement(By.id("s2id_customFilter")).sendKeys(Keys.ARROW‌​_DOWN);