chore: rename demo files.

src/Shared/HandyControlDemo_Shared/UserControl/Controls/PinBoxDemo.xaml

@@ -0,0 +1,14 @@
+<UserControl x:Class="HandyControlDemo.UserControl.PinBoxDemoCtl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:hc="https://handyorg.github.io/handycontrol"
+             Background="{DynamicResource RegionBrush}">
+    <hc:TransitioningContentControl>
+        <hc:UniformSpacingPanel Spacing="16" Orientation="Vertical" Margin="32" VerticalAlignment="Center" hc:PinBox.Completed="PinBox_OnCompleted">
+            <hc:PinBox Length="4" Password="1234"/>
+            <hc:PinBox Length="4" Password="1234" Name="PinBoxDemo" IsSafeEnabled="False"/>
+            <TextBox Text="{Binding UnsafePassword,ElementName=PinBoxDemo,UpdateSourceTrigger=PropertyChanged}"/>
+            <hc:PinBox Length="6" Password="123456" PasswordChar="❤"/>
+        </hc:UniformSpacingPanel>
+    </hc:TransitioningContentControl>
+</UserControl>