title: Little warning message on textbox
body: <p>I have a textbox that's really only supposed to take so many characters, but it can take more if it needs to. What I'd like to do is have a small little message window pop up when the user passes a certain number of characters. I know how to trigger an event when the user passes however-many characters, but I don't know how to make a little warning window come up.</p>
  
  <p>Theres <code>MessageBox</code>, but it's a little big and bulky for what I need. I'm imagining a small white or yellow bubble coming up, and then slowly fading away, I know I've seen it before, I just don't know what it's called, or how to create one in C#.</p>
  
  <p>If anyone knows the name of what I'm thinking of and how to make it in winforms, or an alternative, that would be great! :)</p>