private void DetachButton(BindableApplicationBarButton button)
{
if (button.GetBindingExpression(DataContextProperty) == null &&
button.GetValue(DataContextProperty) == this.DataContext)
{
button.DataContext = null;
}
button.Detach();
}
private void AttachButton(BindableApplicationBarButton button, int i)
{
if (button.GetBindingExpression(
FrameworkElement.DataContextProperty) == null &&
button.GetValue(
FrameworkElement.DataContextProperty) == null)
{
button.DataContext = this.DataContext;
}
button.Attach(this.applicationBar, i);
}