How to wait AddToViewport complete?

Development Programming & Scripting C++
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1

I found that “addtoviewport” did not work immediately.

LoadingMessage->AddToViewport();    
...//Some Complex Computations

It will not show the “LoadingMessage” Widget until all the computations are completed. So…How to make computations after “LoadingMessage” being added to viewport?

2

My solution is: create a new thread