Watermark text

I created a practice atlas website, put a textbox on the form, dragged the script manager and watermark control to the form. Went to the properties of the textbox and the watermark referance was there with a plus sign. Clicked on the + sign and nothing was there, I could not insert any text. What am I missing? Thank you.I got it working locally but receive this error on the remote server.

Unknown server tag 'atlas:ScriptManager'.
It seems like maybe the remote server's not seeing the Atlas DLL as registered? Maybe check that there's an @.Register for it or a corresponding entry for it in the web.config on that machine.