set default lidtboxitem style, fixes #511

Author: ButchersBoy

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.Defaults.xaml

@@ -58,6 +58,7 @@
     <Style TargetType="{x:Type GroupBox}" BasedOn="{StaticResource MaterialDesignGroupBox}" />
     <Style TargetType="{x:Type Label}" BasedOn="{StaticResource MaterialDesignLabel}" />
     <Style TargetType="{x:Type ListBox}" BasedOn="{StaticResource MaterialDesignListBox}" />
+    <Style TargetType="{x:Type ListBoxItem}" BasedOn="{StaticResource MaterialDesignListBoxItem}" />
     <Style TargetType="{x:Type PasswordBox}" BasedOn="{StaticResource MaterialDesignPasswordBox}" />
     <Style TargetType="{x:Type ProgressBar}" BasedOn="{StaticResource MaterialDesignLinearProgressBar}" />
     <Style TargetType="{x:Type RadioButton}" BasedOn="{StaticResource MaterialDesignRadioButton}" />

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.ListBox.xaml

@@ -320,8 +320,7 @@
         <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
         <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
         <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
-        <Setter Property="VerticalContentAlignment" Value="Center"/>        
-        <Setter Property="ItemContainerStyle" Value="{StaticResource MaterialDesignListBoxItem}"/>        
+        <Setter Property="VerticalContentAlignment" Value="Center"/>                
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type ListBox}">