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The SuggestBox control supports the following API to support viewmodel binding and standard communication within an MVVM application:

TextBox

Dependency Property	Description
ICommandTextChangedCommand	Gets/sets a command that should be executed whenever the text in the textbox portion of this control has changed.
string Hint	Gets/sets a Watermark Hint that is shown if the user has not typed anything, yet, and if IsHintVisible is consfigured accordingly.
bool IsHintVisible	Gets/sets whether Watermark in the textbox portion of suggestion box is currently visible or not.
ValidationRule PathValidation	Gets/sets a ValidationRule that must be present to show a validation error (red rectangle around textbox) if user entered invalid data.
bool ValidText	Gets/sets whether the current text should be marked as invalid (control shows a red rectangle around the textbox portion or not).

ListBox in Suggestions Pop-up control

Dependency Property	Description
bool EnableSuggestions	Gets/sets whether suggestions should currently be queried and viewed or not.
bool IsPopupOpened	Gets/sets whether the Popup portion of the control is currently open or not.
string DisplayMemberPath	Gets/sets the DisplayMemberPath for the ListBox portion of the suggestion popup.
string SelectedValuePath	Gets/sets the SelectedValuePath for the ListBox portion of the suggestion popup.
DataTemplate ItemTemplate	Gets/sets the ItemTemplate for the ListBox portion of the suggestion popup.
Brush PopupBorderBrush	Gets/sets the Brush of the border in the popup of the suggestion box.
Thickness PopupBorderThickness	Gets/sets the of the border in the popup of the suggestion box.
IEnumerable ItemsSource	Gets/sets an IEnumerable ItemsSource for the list of objects that pops up when the user has entered some text. Ideally, this should be an ObservableCollection<T> since the control with look for the INotifyCollectionChanged event in order to listen for this type of event.
bool IsDeferredScrolling	Gets/sets whether the scrollbar ListBox inside the suggestions PopUp control is directly linked to scrolling the content or not (is deferred). This property is handled by the control itself and should not be used via binding.