Get EVERY selected item within a paginated multiselect grid with JavaScript

From custom.js I try to collect all selected elements in a multi-select paginated grid. The standard Telerik select() method (http://docs.telerik.com/kendo-ui/api/javascript/ui/grid#methods-select) only returns all selected elements of the currently selected page (not mentioning what happens when filtering).

But somehow this "state" must be accessible, as changing pages reveals selected items on any other page.

So if anybody of you is lookin into this as well and can point out where the localStorage of this state can be found, or if you have a workaround for this, I'd be very happy to engage.

If you're interested, this is needed to 'finish' the "Order Summary" (https://blog.jhnr.ch/2016/07/04/advanced-cireson-service-manager-portal-customizations/) feature of my customizations.
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