You have many possible approaches for exploration. The simplest is to call the method in the code-behind file of the Page when the requested data arrives. We do this in our own projects.
Another approach would be to define a command that does it and trigger it when the data you have requested arrives.
As I do not know the architecture of your application, I cannot say for sure which approach you should use. Also note that MVVM is an approach that does not solve all problems in an elegant way and using it for everything might lead to over-engineered architecture. This, of course, is my personal opinion :-)
Let me know in case I can be of further help.
All the best,
the Telerik team
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