I was recently working on a visual web part in SharePoint 2013. I added a people editor control on the ascx file. And when I tried to enter the user's name and press enter, the text box started behaving like a multiline textbox. It did not validate the user. Even when I searched for the user and selected, the user did not show up in the textbox. The HTML for the control is simple. I have used this in many other projects. I went crazy. There is so much to learn in SharePoint. SharePoint makes you feel humble, rookie :) This is how the people editor behaved... I tried many things. I even tried to implement Client people picker introduced in SharePoint 2013. Then I stumbled upon a blog by Bill Daugherty II. He had explained about some issue he is facing. Which thankfully worked for me too. http://myspexp.com/2011/03/23/using-the-sharepoint-peopleeditor-in-a-gridview/ The solution was to give a script reference to EntityEditor.js file from _layouts. < script t...