class FViewModel : public [UE::Sequencer::ICastable](API\Editor\SequencerCore\MVVM\ICastable), public [TSharedFromThis< FViewModel >](API\Runtime\Core\Templates\TSharedFromThis), public [UE::Sequencer::FDynamicExtensionContainer](API\Editor\SequencerCore\MVVM\Extensions\FDynamicExtensionContainer)