Controls derived from native controls aren't themed

Hello,

When you enable native control theming, we effectively inject some implicit Styles that target native controls into the app's Resources.  Those implicit styles might not get applied if your other derived controls have their own default Style.

That being said, it's easy to make implicit Styles for those controls too if styles aren't working:

<Style TargetType="local:ResetButton" BasedOn="{StaticResource {x:Static themes:SharedResourceKeys.ButtonBaseStyleKey}}" />

Or if you do define a default Style for derived controls, then just use the BasedOn above too.  There are SharedResourceKeys entries for all the native controls we theme.

Would you please show me the equivallent of that in C# code?

Normally it would be done something like this:

var style = new Style();
style.TargetType = typeof(ResetButton);
style.BasedOn = this.FindResource(ActiproSoftware.Windows.Themes.SharedResourceKeys.ButtonBaseStyleKey) as Style;
// Application.Current.Resources.Add(null, style);

But I'm not sure how to add an implicit Style to a ResourceDictionary via code-behind since the last commented-out line doesn't work.  Implicit styles don't use x:Key.  There doesn't seem to be any documentation we can find that tells how either.  We'd recommend using XAML for this anyhow, per above... there's no issue in pure XAML.