Added WindowButtonDefinition.

#12

Horizon/Resources/UI/ControlDefinitions/WindowButtonDefinition.xaml

@@ -0,0 +1,37 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Style TargetType="{x:Type Button}" x:Key="WindowButtonStyle">
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type ButtonBase}">
+                    <Border
+                        x:Name="Chrome"
+                        BorderBrush="{TemplateBinding BorderBrush}"
+                        Margin="0"
+                        Background="{TemplateBinding Background}"
+                        SnapsToDevicePixels="True">
+                        <ContentPresenter
+                            ContentTemplate="{TemplateBinding ContentTemplate}"
+                            Content="{TemplateBinding Content}"
+                            ContentStringFormat="{TemplateBinding ContentStringFormat}"
+                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
+                            Margin="{TemplateBinding Padding}"
+                            RecognizesAccessKey="True"
+                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
+                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
+                    </Border>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+        <Setter Property="Background" Value="Transparent" />
+        <Setter Property="FontFamily" Value="Webdings" />
+        <Setter Property="FontSize" Value="13.333" />
+        <Setter Property="Foreground" Value="{DynamicResource BaseFontColor}" />
+        <Setter Property="Margin" Value="0,2,3,0" />
+        <Style.Triggers>
+            <Trigger Property="IsMouseOver" Value="True">
+                <Setter Property="Foreground" Value="{DynamicResource BaseHighlightColor}" />
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+</ResourceDictionary>

Horizon/Resources/UI/Controls.xaml

@@ -2,6 +2,7 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit">
     <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="ControlDefinitions/WindowButtonDefinition.xaml" />
         <ResourceDictionary Source="ControlDefinitions/WindowDefinition.xaml" />
     </ResourceDictionary.MergedDictionaries>