How can I SetKeyboardFocus on a UEditableTextBox in UserWidget at game beginning?

Development Programming & Scripting UI
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I test and fount that:
UEditableTextBox::SetKeyboardFocus() only works at GameMode::BeginPlay(), but I want a override function in UUserWidget and invoke SetKeyboardFocus() in it, because I want put all UI logic code in UserWidget class.
UUserWidget has no BeginPlaye() function and even I call SetKeyboardFocus in UUserWidget::Initialize() function, it doesn’t work.