Adjust project structure

src/Shared/HandyControlDemo_Shared/UserControl/Styles/RichTextBoxDemoCtl.xaml

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+<UserControl x:Class="HandyControlDemo.UserControl.RichTextBoxDemoCtl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"
+             xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+             Background="{DynamicResource RegionBrush}">
+    <controls:TransitioningContentControl>
+        <RichTextBox Margin="32" Width="400" Height="300" ScrollViewer.VerticalScrollBarVisibility="Auto">
+            <FlowDocument>
+                <Paragraph>
+                    <Run FontSize="20" Text="{Binding Source={x:Static langs:Lang.Title},Converter={StaticResource StringRepeatConverter},ConverterParameter=20,Mode=OneWay}"/>
+                </Paragraph>
+                <Paragraph>
+                    <Run Text="{Binding Source={x:Static langs:Lang.Text},Converter={StaticResource StringRepeatConverter},ConverterParameter=1000,Mode=OneWay}"/>
+                </Paragraph>
+                <Paragraph>
+                    <Hyperlink>https://github.com/NaBian/HandyControl</Hyperlink>
+                </Paragraph>
+            </FlowDocument>
+        </RichTextBox>
+    </controls:TransitioningContentControl>
+</UserControl>