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Resolved

Operation is not valid due to the current state of the object.

description

I have the same problem.
 
In my case I've got the Map control on a TabItem withen a TabControl. On first rendering it appears fine, however if I switch to another tab then switch back I get this error.
 
As a quick & dirty workaround I enclosed the
 
this.Host.RenderEngine.ManuallyInitializeRender();
 
in a try { ... } catch {} which got around the problem .... but .... aint quite ideal

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