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");
Resolved: http://community.infragistics.com/forums/t/47093.aspx
Use the $find('<%= WebTab1.ClientID %>') method to get the reference to the WebTab object and then use the setSize() function to set the size of the control at runtime.
Thanks Viktor!