how to show the suggest when I click the autosuggest (focused?)

Question

I have to place blank space key to show the suggest

Answer 1

Because AutoSuggestBox is sealed, you need to implement your AutoSuggestBox based on microsoft-ui-xaml/dev/AutoSuggestBox.

According to microsoft-ui-xaml/dev/AutoSuggestBox /AutoSuggestBox_themeresources_v1.xaml, my workaround looks like:

        protected override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            popup = this.GetTemplateChild("SuggestionsPopup") as Popup;
            this.GotFocus += (sender, e) => {
                var s = sender as YourAutoSuggestBox;
                s.popup.IsOpen = true;
            };
        }