support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/UserControl/Styles/RichTextBoxDemoCtl.xaml

@@ -0,0 +1,19 @@
+<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:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+             Background="{DynamicResource RegionBrush}">
+    <RichTextBox Margin="32" Width="400" Height="300" ScrollViewer.VerticalScrollBarVisibility="Auto">
+        <FlowDocument>
+            <Paragraph>
+                <Run Name="RunTitle" FontSize="20"/>
+            </Paragraph>
+            <Paragraph>
+                <Run Name="RunText"/>
+            </Paragraph>
+            <Paragraph>
+                <Hyperlink>https://github.com/NaBian/HandyControl</Hyperlink>
+            </Paragraph>
+        </FlowDocument>
+    </RichTextBox>
+</UserControl>