add style and demo

src/Shared/HandyControl_Shared/Themes/Styles/SplitButton.xaml

@@ -1,10 +1,42 @@
 <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="Base/SplitButtonBaseStyle.xaml"/>
     </ResourceDictionary.MergedDictionaries>
 
-    <Style BasedOn="{StaticResource SplitButtonBaseStyle}" TargetType="controls:SplitButton"/>
+    <Style BasedOn="{StaticResource SplitButtonBaseStyle}" TargetType="controls:SplitButton">
+        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
+        <Setter Property="BorderThickness" Value="1"/>
+        <Style.Triggers>
+            <Trigger Property="IsMouseOver" Value="True">
+                <Setter Property="Background" Value="{DynamicResource DarkDefaultBrush}"/>
+            </Trigger>
+            <Trigger Property="IsPressed" Value="True">
+                <Setter Property="Background" Value="{DynamicResource BorderBrush}"/>
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+
+    <Style x:Key="SplitButtonPrimary"  BasedOn="{StaticResource SplitButtonBaseStyle}" TargetType="controls:SplitButton">
+        <Setter Property="Background" Value="{DynamicResource PrimaryBrush}"/>
+    </Style>
+
+    <Style x:Key="SplitButtonSuccess"  BasedOn="{StaticResource SplitButtonBaseStyle}" TargetType="controls:SplitButton">
+        <Setter Property="Background" Value="{DynamicResource SuccessBrush}"/>
+    </Style>
+
+    <Style x:Key="SplitButtonInfo"  BasedOn="{StaticResource SplitButtonBaseStyle}" TargetType="controls:SplitButton">
+        <Setter Property="Background" Value="{DynamicResource InfoBrush}"/>
+    </Style>
+
+    <Style x:Key="SplitButtonWarning"  BasedOn="{StaticResource SplitButtonBaseStyle}" TargetType="controls:SplitButton">
+        <Setter Property="Background" Value="{DynamicResource WarningBrush}"/>
+    </Style>
+
+    <Style x:Key="SplitButtonDanger"  BasedOn="{StaticResource SplitButtonBaseStyle}" TargetType="controls:SplitButton">
+        <Setter Property="Background" Value="{DynamicResource DangerBrush}"/>
+    </Style>
 
 </ResourceDictionary>