为什么我的XAML ToggleButton对隐藏的代码不可见？

Question

I have a ToggleButton in MainPage.xaml:

<ToggleButton x:Name="ColorToggle" Background="{Binding Background, ElementName=LayoutRoot}" ToolTipService.ToolTip="Change Toolbar Color">

...yet when I try to access it from MainPage.xaml.cs:

private void SaveAppBarColorSelected(object sender, TappedRoutedEventArgs e)
{
    PhotraxUtils.SetLocalSetting(PhotraxConsts.APPBARBUTTON_COLOR, ColorToggle.Background.ToString());
}

...I get, " The name 'ColorToggle' does not exist in the current context "

Why is that?

Answer 1

Only controls from the root context are available in code-behind. If you place your named control inside a template, it won't be available. You can traverse the controls tree using VisualTreeHelper and other methods in this case.

Or better yet, just use MVVM.