Question

Implicit Style not working in App.xaml, but is working with local page resources. How do I make a global style for a control?

<navigation:Page.Resources>
 <Style TargetType="Button">
  <Setter Property="Background" Value="Red" />
  <Setter Property="Foreground" Value="Navy" />
 </Style>
</navigation:Page.Resources>

Answer 1

In App.xaml

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="StilDict.xaml" />
        </ResourceDictionary.MergedDictionaries>
 </ResourceDictionary>

In StilDict.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  ,,,, and what you use else>
<Style x:Key="ButtonStyleNavyOnRed" TargetType="Button">
<Setter Property="Background" Value="Red" />
<Setter Property="Foreground" Value="Navy" />
</Style>

using style anywhere on your project

 <UserControl>
    <Button Style={StaticResource ButtonStyleNavyOnRed} Content="Yahoo! :)"/>
 </UserControl>

Important Note if you delete x:Key=”ButtonStyleNavyOnRed” part all of your Target types get this style, but not Button derived objects. http://msdn.microsoft.com/en-us/library/system.windows.style(v=vs.95).aspx

Hope Helps!