Selection disappears on IE

Hi,

We are trying to integrate ckeditor in our application.

We are encoutering one issue with the selection done on CkEditor on IE. We need to provide a functionality when user does a selection on CkEditor and clicks a button outside the editor

When we are trying to do this on Mozilla or any other browser, the selections is retain and we get the selection value by using selection api. But for IE, the selection just disappears just on click of button and button have not been released yet.
This behaviour can also be seen in demo ckeditor(http://ckeditor.com/demo). If we select something on ckeditor in IE and just click something out side the ckeditor and not release the mouse button one can see the selection just goes away. But its retained in other browser.

Please let us know if we are doing something incorrect here.

Thanks - Chakresh