public override void OnApplyTemplate()
{
if (_popup != null)
{
_popup.Closed -= popup_Closed;
}
if (_button != null)
{
_button.Checked -= button_Checked;
}
_popup = GetTemplateChild("popup") as Popup;
_button = GetTemplateChild("button") as ToggleButton;
_combo = GetTemplateChild("nameCombo") as ComboBox;
_typeCombo = GetTemplateChild("typeCombo") as MyComboBox;
if (_button != null)
{
_button.Checked += button_Checked;
}
if (_popup != null)
{
_popup.Closed += popup_Closed;
}
if (_combo != null)
{
_combo.PreviewKeyDown += _combo_PreviewKeyDown;
}
// Circumvent a bug in WPF: this binding is already declared in XAML but WPF removes it for piercing boxes that are not loaded at the start of the application.
_typeCombo.SetBinding(MyComboBox.SelectedValueProperty, "Type");
}
static void OnItemsSourceChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
MyComboBox box = (MyComboBox)obj;
box.PopulateInternalItems();
box.AddUnknownItem();
}
static void OnSelectedValueChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
MyComboBox box = (MyComboBox)obj;
box.AddUnknownItem();
}