support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Themes/Styles/Base/LoadingLineBaseStyle.xaml

@@ -0,0 +1,13 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:controls="clr-namespace:HandyControl.Controls">
+
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="LoadingBaseStyle.xaml"/>
+    </ResourceDictionary.MergedDictionaries>
+    
+    <Style x:Key="LoadingLineBaseStyle" BasedOn="{StaticResource LoadingBaseStyle}" TargetType="controls:LoadingLine">
+        <Setter Property="DotDiameter" Value="5"/>
+    </Style>
+
+</ResourceDictionary>