support for .NET framework 3.5

Still have bugs

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

@@ -0,0 +1,27 @@
+<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="BaseStyle.xaml"/>
+        <ResourceDictionary Source="../../Basic/Sizes.xaml"/>
+    </ResourceDictionary.MergedDictionaries>
+
+    <Style x:Key="ButtonBaseBaseStyle" BasedOn="{StaticResource BaseStyle}" TargetType="ButtonBase">
+        <Setter Property="Height" Value="{StaticResource DefaultControlHeight}"/>
+        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
+        <Setter Property="Padding" Value="{StaticResource DefaultControlPadding}"/>
+        <Setter Property="Foreground" Value="{DynamicResource TextIconBrush}"/>
+        <Setter Property="controls:IconElement.Width" Value="18"/>
+        <Setter Property="controls:IconElement.Height" Value="18"/>
+        <Setter Property="BorderThickness" Value="0"/>
+        <Setter Property="HorizontalAlignment" Value="Center"/>
+        <Setter Property="VerticalAlignment" Value="Center"/>
+        <Setter Property="HorizontalContentAlignment" Value="Center"/>
+        <Setter Property="VerticalContentAlignment" Value="Center"/>
+        <Setter Property="IsTabStop" Value="False"/>
+        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
+        <Setter Property="Focusable" Value="False"/>
+    </Style>
+
+</ResourceDictionary>