diff --git a/src/Shared/XamlHelper.cpp b/src/Shared/XamlHelper.cpp
index b08f959..a6bf3df 100644
--- a/src/Shared/XamlHelper.cpp
+++ b/src/Shared/XamlHelper.cpp
@@ -1,6 +1,8 @@
 #include "pch.h"
 #include "XamlHelper.h"
+#include "Win32Helper.h"
 #include <winrt/Windows.UI.Xaml.Media.h>
+#include <vector>
 
 namespace winrt {
 using namespace Windows::UI::Xaml;
@@ -84,4 +86,47 @@ void XamlHelper::CloseComboBoxPopup(winrt::XamlRoot const& root) {
 	}
 }
 
+void XamlHelper::UpdateThemeOfXamlPopups(winrt::XamlRoot const& root, winrt::ElementTheme theme) {
+	for (const auto& popup : winrt::VisualTreeHelper::GetOpenPopupsForXamlRoot(root)) {
+		winrt::FrameworkElement child = popup.Child().as<winrt::FrameworkElement>();
+		child.RequestedTheme(theme);
+		UpdateThemeOfTooltips(child, theme);
+	}
+}
+
+void XamlHelper::UpdateThemeOfTooltips(winrt::DependencyObject const& root, winrt::ElementTheme theme) {
+	if (Win32Helper::GetOSVersion().IsWin11()) {
+		// Win11 中 Tooltip 自动适应主题
+		return;
+	}
+
+	// 遍历 XAML 树
+	std::vector<winrt::DependencyObject> elems{ root };
+	do {
+		std::vector<winrt::DependencyObject> temp;
+
+		for (const winrt::DependencyObject& elem : elems) {
+			const int count = winrt::VisualTreeHelper::GetChildrenCount(elem);
+			for (int i = 0; i < count; ++i) {
+				winrt::DependencyObject current = winrt::VisualTreeHelper::GetChild(elem, i);
+
+				if (winrt::IInspectable tooltipContent = winrt::ToolTipService::GetToolTip(current)) {
+					if (winrt::ToolTip tooltip = tooltipContent.try_as<winrt::ToolTip>()) {
+						tooltip.RequestedTheme(theme);
+					} else {
+						winrt::ToolTip themedTooltip;
+						themedTooltip.Content(tooltipContent);
+						themedTooltip.RequestedTheme(theme);
+						winrt::ToolTipService::SetToolTip(current, themedTooltip);
+					}
+				}
+
+				temp.emplace_back(std::move(current));
+			}
+		}
+
+		elems = std::move(temp);
+	} while (!elems.empty());
+}
+
 }
diff --git a/src/Shared/XamlHelper.h b/src/Shared/XamlHelper.h
index aed7e23..5366aef 100644
--- a/src/Shared/XamlHelper.h
+++ b/src/Shared/XamlHelper.h
@@ -5,7 +5,18 @@ namespace XamlIslandsCpp {
 
 struct XamlHelper {
 	static void RepositionXamlPopups(winrt::Windows::UI::Xaml::XamlRoot const& root, bool closeFlyoutPresenter);
+
 	static void CloseComboBoxPopup(winrt::Windows::UI::Xaml::XamlRoot const& root);
+
+	static void UpdateThemeOfXamlPopups(
+		const winrt::Windows::UI::Xaml::XamlRoot& root,
+		winrt::Windows::UI::Xaml::ElementTheme theme
+	);
+
+	static void UpdateThemeOfTooltips(
+		const winrt::Windows::UI::Xaml::DependencyObject& root,
+		winrt::Windows::UI::Xaml::ElementTheme theme
+	);
 };
 
 }
diff --git a/src/XamlIslandsCpp.App/RootPage.cpp b/src/XamlIslandsCpp.App/RootPage.cpp
index 8fd4b8b..6be0fb4 100644
--- a/src/XamlIslandsCpp.App/RootPage.cpp
+++ b/src/XamlIslandsCpp.App/RootPage.cpp
@@ -5,6 +5,7 @@
 #endif
 #include "Win32Helper.h"
 #include "CommonSharedConstants.h"
+#include "XamlHelper.h"
 
 using namespace XamlIslandsCpp;
 
@@ -43,6 +44,12 @@ void RootPage::Theme(int value) {
 	_propertyChangedEvent(*this, PropertyChangedEventArgs(L"Theme"));
 }
 
+void RootPage::ComboBox_DropDownOpened(IInspectable const&, IInspectable const&) const {
+	// 修复下拉框不适配主题的问题
+	// https://github.com/microsoft/microsoft-ui-xaml/issues/6622
+	XamlHelper::UpdateThemeOfXamlPopups(XamlRoot(), ActualTheme());
+}
+
 static Color Win32ColorToWinRTColor(COLORREF color) {
 	return { 255, GetRValue(color), GetGValue(color), GetBValue(color) };
 }
diff --git a/src/XamlIslandsCpp.App/RootPage.h b/src/XamlIslandsCpp.App/RootPage.h
index dcc7f77..e528a78 100644
--- a/src/XamlIslandsCpp.App/RootPage.h
+++ b/src/XamlIslandsCpp.App/RootPage.h
@@ -24,6 +24,8 @@ struct RootPage : RootPageT<RootPage> {
 	int Theme() const noexcept;
 	void Theme(int value);
 
+	void ComboBox_DropDownOpened(IInspectable const&, IInspectable const&) const;
+
 private:
 	void _SetTheme(AppTheme theme);
 
diff --git a/src/XamlIslandsCpp.App/RootPage.xaml b/src/XamlIslandsCpp.App/RootPage.xaml
index 1ea677f..1c0e7b5 100644
--- a/src/XamlIslandsCpp.App/RootPage.xaml
+++ b/src/XamlIslandsCpp.App/RootPage.xaml
@@ -48,6 +48,7 @@
 				<ComboBox MinWidth="120"
 				          HorizontalAlignment="Right"
 				          VerticalAlignment="Center"
+				          DropDownOpened="ComboBox_DropDownOpened"
 				          SelectedIndex="{x:Bind Theme, Mode=TwoWay}">
 					<ComboBoxItem x:Uid="Theme_Light" />
 					<ComboBoxItem x:Uid="Theme_Dark" />
@@ -59,6 +60,7 @@
 				<ComboBox MinWidth="120"
 				          HorizontalAlignment="Right"
 				          VerticalAlignment="Center"
+				          DropDownOpened="ComboBox_DropDownOpened"
 				          SelectedIndex="0">
 					<ComboBoxItem x:Uid="Background_Solid" />
 					<ComboBoxItem>Acrylic</ComboBoxItem>
diff --git a/src/XamlIslandsCpp.App/TitleBarControl.cpp b/src/XamlIslandsCpp.App/TitleBarControl.cpp
index 37c5d61..b30b68a 100644
--- a/src/XamlIslandsCpp.App/TitleBarControl.cpp
+++ b/src/XamlIslandsCpp.App/TitleBarControl.cpp
@@ -11,6 +11,7 @@ namespace winrt::XamlIslandsCpp::App::implementation {
 
 void TitleBarControl::IsWindowActive(bool value) {
 	VisualStateManager::GoToState(*this, value ? L"Active" : L"NotActive", false);
+	CaptionButtons().IsWindowActive(value);
 }
 
 }
diff --git a/src/XamlIslandsCpp/MainWindow.cpp b/src/XamlIslandsCpp/MainWindow.cpp
index 67feb3b..9466d4e 100644
--- a/src/XamlIslandsCpp/MainWindow.cpp
+++ b/src/XamlIslandsCpp/MainWindow.cpp
@@ -186,10 +186,7 @@ LRESULT MainWindow::_MessageHandler(UINT msg, WPARAM wParam, LPARAM lParam) noex
 	}
 	case WM_ACTIVATE:
 	{
-		if (_isCustomTitleBarEnabled) {
-			_content.TitleBar().IsWindowActive(LOWORD(wParam) != WA_INACTIVE);
-		}
-		
+		_content.TitleBar().IsWindowActive(LOWORD(wParam) != WA_INACTIVE);
 		break;
 	}
 	case WM_DESTROY: