Set UMG ViewModel for UUserWidget C++

Development Programming & Scripting
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1

Hi! I try to set UMG Viewmodel in c++, but i dont understand how to do this, so in my CustomUserWidget Class:

#include "View/MVVMView.h"
#include "MVVMSubsystem.h"

if (UMVVMView* View = UMVVMSubsystem::GetViewFromUserWidget(this)) //returned nullptr
{
    View->SetViewModelByClass(UserWidgetViewModel);
}

But UMVVMSubsystem::GetViewFromUserWidget is returned nullptr, so i found that UMVVMView class is UUserWidgetExtension, so i tried add extension in my widget class like this:

this->AddExtension<UMVVMView>();

but it is not working too( how can i do this, where i can find documentation? Thanks!