The desired behavior is the WebTab control resizes dynamically as the browser window is resized. 

Viktor's method (http://community.infragistics.com/forums/t/47093.aspx), using the <ClientEvents Loaded="function"/> method works well for the initial screen load; however, if the user resizes the screen, there is no way to trigger the resize method, and there doesn't seem to be a way to call the setSize() method on the WebTab NOT through the <ClientEvents />.  

E.g. the following does not work: 

var t = document.getElementById("WebTab1"); 

t.setSize("100px", "400px");