UserControl styles not applied when embedded in a Window? - wpf

Question

I am creating a simple WPF Gui. I am trying to apply implicit styles to all UserControls to give them some default appearances - the background color, and font. This seems to work on the user control itself. However, when the user control is embedded in a Window the styles are list.
For example, here is a user control:
Code:
<UserControl x:Class="NtpClient.Gui.Components.MainPanel.MainPanelView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:serverSelector="clr-namespace:NtpClient.Gui.Components.ServerSelector"
xmlns:detailsPanel="clr-namespace:NtpClient.Gui.Components.DetailsPanel"
Height="350" Width="400">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<serverSelector:ServerSelectorView Grid.Column="0" Padding="6" />
<detailsPanel:DetailsPanelView Grid.Column="1" Padding="6" />
</Grid>
</UserControl>
And here is the Window with the UserControl in:
Code:
<Window x:Class="NtpClient.Gui.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mainPanel="clr-namespace:NtpClient.Gui.Components.MainPanel"
Title="Network Time Servers" Height="350" Width="400">
<mainPanel:MainPanelView Width="auto" Height="auto"/>
</Window>
The Themes file is set in app.xaml and looks like this:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Themes_CoreThemes;component/ControlStyles.xaml" />
<ResourceDictionary Source="/Themes_CoreThemes;component/BrushResources.xaml" />
</ResourceDictionary.MergedDictionaries>
<!-- Implicit Styles -->
<Style BasedOn="{StaticResource DeepBlueButtonStyle}" TargetType="Button" />
<Style BasedOn="{StaticResource ControlStyle}" TargetType="UserControl" />
</ResourceDictionary>
App.xaml:
<Application x:Class="NtpClient.Gui.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Themes_CoreThemes;component/ControlStyles.xaml" />
<ResourceDictionary Source="/Themes_CoreThemes;component/BrushResources.xaml" />
<ResourceDictionary Source="Themes/Local/Local.MSControls.Core.Implicit.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
Does anyone have any idea what is causing this, and how I resolve it?

Answer 1

I've faces that problem some month's ago.
It's because your xaml files are in other dll's.
I don't know why, but designer isn't handling that properly.
Look like it's external issue of Designer.
I've just moved styles from dll's to the main project.