How do I get an overlay added behind the kendo-window that will disable the background...

I am using Kendo UI Window instead of dialog so that user can see the data behind the window but i want to disable the click events behind the window.

I have tried to set the htmlAttributes: {'modal': 'true'} while opening the kendo window using kendow service but its not working.
const windowRef = this.windowService.open({ title: compTitle, content: compName, cssClass: "menu-window", htmlAttributes: {['modal']: "true"}, });

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