Slider disabling doesn't work in IE 9 and IE10

[sumitdutta]

http://jsfiddle.net/Jp63w/1/ - Example

Slider disabling is not working in IE9 and IE10. It works in Chrome and Mozilla.

In chrome and mozilla below statement works once and then it disables.

$('.selector').slider('disable');

but in chrome and mozilla below statement disables on page load.

$('#qty').slider({ disabled: "true" });

Both the method placed in document ready

$(document).ready(function () {
    $('.selector').slider('disable'); 
    $('.selector').slider({ disabled: "true" });
});

I believe both the above statement should behave same.