It looks like .restore() doesn't return the window object as it should, breaking chaining.

Example:

- This works:
mywin.data('kendoWindow').title("hi").open().toFront().restore(); 

- This does not work.  It will throw "Cannot call method 'toFront' of undefined" in latest version of Chrome.
mywin.data('kendoWindow').title("hi").open().restore().toFront();