Added outline style for MahApp NumericUpDown and added to demo. fixes #2448 (#2466)

Author: stigrune

MahMaterialDragablzMashUp/Mah.xaml

@@ -66,6 +66,9 @@
                     <smtx:XamlDisplay UniqueKey="NumericUpDown_2">
                         <controls:NumericUpDown Culture="ar-EG" FlowDirection="RightToLeft" Margin="5" controls:TextBoxHelper.SelectAllOnFocus="True"/>
                     </smtx:XamlDisplay>
+                    <smtx:XamlDisplay UniqueKey="NumericUpDown_3">
+                        <controls:NumericUpDown Style="{StaticResource MaterialDesignOutlinedNumericUpDown}"/>
+                    </smtx:XamlDisplay>
                 </StackPanel>
             </TabItem>
             <TabItem Header="DataGrid">

MaterialDesignThemes.MahApps/Themes/MaterialDesignTheme.MahApps.NumericUpDown.xaml

@@ -257,6 +257,15 @@
                             <Setter TargetName="PART_NumericDown" Property="Visibility" Value="Collapsed" />
                             <Setter TargetName="PART_NumericUp" Property="Visibility" Value="Collapsed" />
                         </Trigger>
+                        <MultiTrigger>
+                            <MultiTrigger.Conditions>
+                                <Condition Property="IsKeyboardFocusWithin" Value="True" />
+                                <Condition Property="mah:ControlsHelper.FocusBorderThickness" Value="1" />
+                                <Condition Property="mah:ControlsHelper.CornerRadius" Value="4" />
+                            </MultiTrigger.Conditions>
+                            <Setter TargetName="Base" Property="BorderThickness" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(mah:ControlsHelper.FocusBorderThickness)}" />
+                            <Setter TargetName="Base" Property="BorderBrush" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(mah:ControlsHelper.MouseOverBorderBrush)}" />
+                        </MultiTrigger>
                     </ControlTemplate.Triggers>
                 </ControlTemplate>
             </Setter.Value>
@@ -265,4 +274,13 @@
         <Setter Property="UpDownButtonsWidth" Value="22" />
         <Setter Property="Validation.ErrorTemplate" Value="{StaticResource MaterialDesignValidationErrorTemplate}" />
     </Style>
+
+    <Style TargetType="{x:Type mah:NumericUpDown}" x:Key="MaterialDesignOutlinedNumericUpDown" BasedOn="{StaticResource MaterialDesignNumericUpDown}">
+        <Setter Property="mah:ControlsHelper.CornerRadius" Value="4" />
+        <Setter Property="mah:ControlsHelper.FocusBorderThickness" Value="1" />
+        <Setter Property="Padding" Value="16" />
+        <Setter Property="BorderThickness" Value="1" />
+        <Setter Property="BorderBrush" Value="{DynamicResource MaterialDesignTextAreaBorder}" />
+    </Style>
+
 </ResourceDictionary>