App.xaml

<Application
    x:Class="UWP_Visual_Asset_Generator.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UWP_Visual_Asset_Generator"
    xmlns:flui="using:FluiFramework.UWP.Core">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                 <!--Frameworks--> 
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
                <flui:FluiFrameworkThemeResources />
                
                 <!--Local Stylesheets-->
                <ResourceDictionary Source="/Styles/Button.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>      
    </Application.Resources>

</Application>