Added a UITest (#19380)

src/Controls/samples/Controls.Sample.UITests/Issues/Issue19380.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue19380"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues">
+    <ContentPage.Resources>
+        <Style TargetType="Switch">
+        <Setter Property="VisualStateManager.VisualStateGroups">
+            <VisualStateGroupList>
+                <VisualStateGroup x:Name="CommonStates">
+                    <VisualState x:Name="Normal" />
+                    <VisualState x:Name="Disabled">
+                        <VisualState.Setters>
+                            <Setter Property="OnColor" Value="Red" />
+                            <Setter Property="ThumbColor" Value="Red" />
+                        </VisualState.Setters>
+                    </VisualState>
+                    <VisualState x:Name="On">
+                        <VisualState.Setters>
+                            <Setter Property="OnColor" Value="Green" />
+                            <Setter Property="ThumbColor" Value="White" />
+                        </VisualState.Setters>
+                    </VisualState>
+                    <VisualState x:Name="Off">
+                        <VisualState.Setters>
+                            <Setter Property="ThumbColor" Value="White" />
+                        </VisualState.Setters>
+                    </VisualState>
+                </VisualStateGroup>
+            </VisualStateGroupList>
+        </Setter>
+    </Style>
+
+    </ContentPage.Resources>
+
+    <StackLayout>
+       <Label Text="Switch with OnColor and Thumb Color explicitly set"/>
+       <Switch AutomationId="switch1" OnColor="red" ThumbColor="Blue"/>
+       <Label Text="Switch with OnColor and Thumb Color controlled by the visual state manager"/>
+       <Switch AutomationId="switch2"/>
+    </StackLayout>
+</ContentPage>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue19380.xaml.cs

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+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 19380, "Switch control ignores OnColor and ThumbColor", PlatformAffected.iOS | PlatformAffected.Android)]
+	public partial class Issue19380 : ContentPage
+	{
+		public Issue19380()
+		{
+			InitializeComponent();
+		}
+	}
+}

src/Controls/tests/UITests/Tests/Issues/Issue19380.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue19380 : _IssuesUITest
+	{
+		public override string Issue => "Switch control ignores OnColor and ThumbColor";
+
+		public Issue19380(TestDevice device) : base(device)
+		{
+		}	
+
+		[Test]
+		public void ShouldOverrideThumbAndOnColorsFromResources()
+		{
+			_= App.WaitForElement("switch1");
+
+			App.Click("switch1");
+			App.Click("switch2");
+
+			// The first switch should have a blue thumb and a red track
+			// The second switch should have a white thumb an a green track
+			App.Screenshot();
+		}
+	}
+}