综合-完善下拉框UI样式，调整属性弹窗文案

PDF Office/App.xaml

@@ -213,9 +213,11 @@
                                         ShadowDepth="0"
                                         Color="#000000" />
                                 </Border.Effect>
+                                <!--  需要补充背景色，如果这里的背景色是透明，按alt消失右键菜单时，会有一瞬间看到透明的右键菜单  -->
                                 <Border
                                     x:Name="Border"
                                     Padding="0,5"
+                                    Background="{StaticResource color.sys.layout.mg}"
                                     CornerRadius="5">
                                     <StackPanel
                                         ClipToBounds="True"

PDF Office/Views/Dialog/PropertiesDialog.xaml

@@ -55,7 +55,7 @@
             FontSize="16"
             FontWeight="Bold"
             Foreground="{StaticResource color.sys.text.neutral.lv1}"
-            Text="Preferences" />
+            Text="Properties" />
         <StackPanel
             Name="StkPnlRight"
             HorizontalAlignment="Right"

PDF Office/Views/MainWindow.xaml.cs

@@ -43,6 +43,8 @@ namespace PDF_Master.Views
             InitializeComponent();
 
             this.SourceInitialized += MainWindow_SourceInitialized;
+
+            System.Windows.Forms.Application.EnableVisualStyles();
         }
 
         private void MainWindow_SourceInitialized(object sender, EventArgs e)