diff --git a/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.h.mux.cs b/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.h.mux.cs
index 59dd5de3ffaa..63c11e64b579 100644
--- a/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.h.mux.cs
+++ b/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.h.mux.cs
@@ -1,10 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using DirectUI;
-using Microsoft.UI.Xaml.Documents;
 using Microsoft.UI.Xaml.Media.Animation;
 using Uno.Disposables;
 using Uno.UI.Xaml.Input;
@@ -16,12 +11,13 @@ partial class ComboBox
 {
 	private const char VK_ESCAPE = (char)0x1B;
 
-// TODO MZ: These disablings should not be required
+	// TODO MZ: These disablings should not be required
 #pragma warning disable CS0067 // Unused only in reference API.
 #pragma warning disable CS0649 // Unused only in reference API.
 #pragma warning disable CS0169 // Unused only in reference API.
 #pragma warning disable CS0168 // Unused only in reference API.
 #pragma warning disable CS0414 // Unused only in reference API.
+#pragma warning disable IDE0055 // Unused only in reference API.
 	internal bool IsSearchResultIndexSet() => m_searchResultIndexSet;
 
 	internal int GetSearchResultIndex() => m_searchResultIndex;
diff --git a/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.mux.cs b/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.mux.cs
index baaf3cbca8ff..a703240587f5 100644
--- a/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.mux.cs
+++ b/src/Uno.UI/UI/Xaml/Controls/ComboBox/ComboBox.partial.mux.cs
@@ -829,9 +829,9 @@ private void OnOpen()
 #if HAS_UNO // Force load children
 			// This method will load the itempresenter children
 #if __ANDROID__
-			SetItemsPresenter((_popup.Child as ViewGroup).FindFirstChild<ItemsPresenter>());
+			SetItemsPresenter((_popup.Child as ViewGroup).FindFirstChild<ItemsPresenter>()!);
 #elif __IOS__ || __MACOS__
-			SetItemsPresenter(_popup.Child.FindFirstChild<ItemsPresenter>());
+			SetItemsPresenter(_popup.Child.FindFirstChild<ItemsPresenter>()!);
 #endif
 #endif
 
diff --git a/src/Uno.UI/UI/Xaml/Controls/Primitives/SelectorItem.partial.mux.cs b/src/Uno.UI/UI/Xaml/Controls/Primitives/SelectorItem.partial.mux.cs
index 5d801a52ea5c..0345f6a9e885 100644
--- a/src/Uno.UI/UI/Xaml/Controls/Primitives/SelectorItem.partial.mux.cs
+++ b/src/Uno.UI/UI/Xaml/Controls/Primitives/SelectorItem.partial.mux.cs
@@ -55,11 +55,11 @@ internal override string GetPlainText()
 
 		var contentTemplateRoot = ContentTemplateRoot;
 
-		if (contentTemplateRoot != null)
+		if (contentTemplateRoot is DependencyObject doContentTemplateRoot)
 		{
 			// we have the first child of the content. Check whether it has an automation name
 
-			strPlainText = AutomationProperties.GetName(contentTemplateRoot);
+			strPlainText = AutomationProperties.GetName(doContentTemplateRoot);
 
 			// fallback: use getplain text on it
 			if (string.IsNullOrEmpty(strPlainText))