add Drawer demo

src/Shared/HandyControl_Shared/Themes/Styles/Base/BadgeBaseStyle.xaml

@@ -1,4 +1,6 @@
-<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 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="../Border.xaml" />

src/Shared/HandyControl_Shared/Themes/Styles/Base/DrawerBaseStyle.xaml

@@ -0,0 +1,10 @@
+<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">
+
+    <Style x:Key="DrawerBaseStyle" TargetType="controls:Drawer">
+        <Setter Property="Dock" Value="Right"/>
+        <Setter Property="MaskBrush" Value="{DynamicResource DarkOpacityBrush}"/>
+    </Style>
+
+</ResourceDictionary>

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

@@ -0,0 +1,10 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
+                    xmlns:controls="clr-namespace:HandyControl.Controls">
+
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="Base/DrawerBaseStyle.xaml" />
+    </ResourceDictionary.MergedDictionaries>
+
+    <Style BasedOn="{StaticResource DrawerBaseStyle}" TargetType="controls:Drawer"/>
+
+</ResourceDictionary>

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

@@ -77,6 +77,7 @@
         <ResourceDictionary Source="SplitButton.xaml"/>
         <ResourceDictionary Source="Divider.xaml"/>
         <ResourceDictionary Source="Poptip.xaml"/>
+        <ResourceDictionary Source="Drawer.xaml"/>
     </ResourceDictionary.MergedDictionaries>
 
 </ResourceDictionary>