in PhotoEditor/DetailPage.cpp [89:100]
void DetailPage::SelectEffectsButton_Click(IInspectable const&, RoutedEventArgs const&)
{
// Show effects previews, hide controls.
VisualStateManager().GoToState(*this, L"ChooseEffects", true);
// Save selected effects so they can be restored if this op is canceled.
m_selectedEffectsTemp.clear();
for (auto&& effectItem : EffectPreviewGrid().SelectedItems())
{
m_selectedEffectsTemp.push_back(effectItem);
}
}