Can't find error provider control in asp.net toolbox?

thankyou..i got it....but what my requirement is instead of displaying some error message beside text box i want to get a red blink...we can easily insert a character like * for mandatory but how can we get a red blinker??!!for example i had taken a required field validator if user haven't provided any information in the text box then instead of getting some message like "enter text" i want to get a red blink...is it possible??