aistudio-wpf-diagram/Demos/AIStudio.Wpf.DiagramDesigner.Demo/App.xaml

<Application x:Class="AIStudio.Wpf.DiagramDesigner.Demo.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:AIStudio.Wpf.DiagramDesigner.Demo"
             xmlns:options="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary>
                    <!-- Accent colors -->
                    <Color x:Key="Fluent.Ribbon.Colors.AccentBaseColor">#FF0078D7</Color>
                    <!--80%-->
                    <Color x:Key="Fluent.Ribbon.Colors.AccentColor80">#CC0078D7</Color>
                    <!--60%-->
                    <Color x:Key="Fluent.Ribbon.Colors.AccentColor60">#990078D7</Color>
                    <!--40%-->
                    <Color x:Key="Fluent.Ribbon.Colors.AccentColor40">#660078D7</Color>
                    <!--20%-->
                    <Color x:Key="Fluent.Ribbon.Colors.AccentColor20">#330078D7</Color>
                    <Color x:Key="Fluent.Ribbon.Colors.HighlightColor">#FF086F9E</Color>
                    <Color x:Key="BlackColor">#FF000000</Color>
                    <Color x:Key="BlackColor20">#51000000</Color>
                    <Color x:Key="WhiteColor">#FFFFFFFF</Color>
                    <Color x:Key="WhiteColor20">#51FFFFFF</Color>
                    <Color x:Key="Gray1">#FF333333</Color>
                    <Color x:Key="Gray2">#FF7F7F7F</Color>
                    <Color x:Key="Gray3">#FF9D9D9D</Color>
                    <Color x:Key="Gray4">#FFA59F93</Color>
                    <Color x:Key="Gray5">#FFB9B9B9</Color>
                    <Color x:Key="Gray6">#FFCCCCCC</Color>
                    <Color x:Key="Gray7">#FFD8D8D9</Color>
                    <Color x:Key="Gray8">#FFE0E0E0</Color>
                    <Color x:Key="Gray9">#5EC9C9C9</Color>
                    <Color x:Key="Gray10">#FFF7F7F7</Color>
                    <Color x:Key="TransparentWhiteColor">#00FFFFFF</Color>
                    <Color x:Key="Fluent.Ribbon.Colors.HighTransparentWhiteColor">#17FFFFFF</Color>

                    <!-- Accent brushes -->
                    <SolidColorBrush x:Key="Fluent.Ribbon.Brushes.AccentBaseColorBrush" Color="{StaticResource Fluent.Ribbon.Colors.AccentBaseColor}" options:Freeze="True" />
                    <SolidColorBrush x:Key="Fluent.Ribbon.Brushes.AccentColorBrush80" Color="{StaticResource Fluent.Ribbon.Colors.AccentColor80}" options:Freeze="True" />
                    <SolidColorBrush x:Key="Fluent.Ribbon.Brushes.AccentColorBrush60" Color="{StaticResource Fluent.Ribbon.Colors.AccentColor60}" options:Freeze="True" />
                    <SolidColorBrush x:Key="Fluent.Ribbon.Brushes.AccentColorBrush40" Color="{StaticResource Fluent.Ribbon.Colors.AccentColor40}" options:Freeze="True" />
                    <SolidColorBrush x:Key="Fluent.Ribbon.Brushes.AccentColorBrush20" Color="{StaticResource Fluent.Ribbon.Colors.AccentColor20}" options:Freeze="True" />
                    <SolidColorBrush x:Key="Fluent.Ribbon.Brushes.HighlightBrush" Color="{StaticResource Fluent.Ribbon.Colors.HighlightColor}" options:Freeze="True" />
                    <SolidColorBrush x:Key="WhiteBrush" Color="{StaticResource WhiteColor}" options:Freeze="True" />
                    <SolidColorBrush x:Key="WhiteBrush20" Color="{StaticResource WhiteColor20}" options:Freeze="True" />
                    <SolidColorBrush x:Key="BlackBrush" Color="{StaticResource BlackColor}" options:Freeze="True" />
                    <SolidColorBrush x:Key="BlackBrush20" Color="{StaticResource BlackColor20}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush1" Color="{StaticResource Gray1}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush2" Color="{StaticResource Gray2}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush3" Color="{StaticResource Gray3}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush4" Color="{StaticResource Gray4}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush5" Color="{StaticResource Gray5}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush6" Color="{StaticResource Gray6}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush7" Color="{StaticResource Gray7}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush8" Color="{StaticResource Gray8}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush9" Color="{StaticResource Gray9}" options:Freeze="True" />
                    <SolidColorBrush x:Key="GrayBrush10" Color="{StaticResource Gray10}" options:Freeze="True" />
                    <SolidColorBrush x:Key="Fluent.Ribbon.Brushes.Button.MouseOver.Background" Color="{StaticResource Fluent.Ribbon.Colors.AccentColor20}" options:Freeze="True" />
                </ResourceDictionary>

                <!--AIStudio-->
                <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.Controls;component/Themes/Colors.xaml"/>
                <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.Controls;component/Themes/MahApps.xaml"/>

                <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.DiagramDesigner;component/Themes/Style.xaml" />
                <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.Flowchart;component/Themes/FlowNode.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>      
    </Application.Resources>
</Application>