@UiHandler("btnSuccessTxtArea")
void onSuccessTxtArea(ClickEvent e) {
txtArea.setSuccess("This is a success message text area.");
}
@UiHandler("btnClearTxtArea")
void onClearTxtArea(ClickEvent e) {
txtArea.clearErrorOrSuccess();
}
@UiHandler("btnErrorTxtArea")
void onErrorTxtArea(ClickEvent e) {
txtArea.setError("This is an error message for text area.");
}