Default IsMonitoring to true (#1541)

This is needed for MahApps attached properties to register for events to respond to things like SelectAllOnFocus.

Fixes #1539

Author: Keboo

MahMaterialDragablzMashUp/Mah.xaml

@@ -40,7 +40,7 @@
             <TabItem Header="NumericUpDown">
                 <StackPanel>
                     <controls:NumericUpDown Margin="5" Value="{Binding UpDownValue, ValidatesOnExceptions=True}"/>
-                    <controls:NumericUpDown Culture="ar-EG" FlowDirection="RightToLeft" Margin="5"/>
+                    <controls:NumericUpDown Culture="ar-EG" FlowDirection="RightToLeft" Margin="5" controls:TextBoxHelper.SelectAllOnFocus="True"/>
                 </StackPanel>
             </TabItem>
             <TabItem Header="DataGrid">

MaterialDesignThemes.MahApps/Themes/MaterialDesignTheme.MahApps.Defaults.xaml

@@ -7,11 +7,13 @@
         <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.MahApps;component/Themes/MaterialDesignTheme.MahApps.Flyout.xaml"/>
         <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.MahApps;component/Themes/MaterialDesignTheme.MahApps.NumericUpDown.xaml"/>
         <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.MahApps;component/Themes/MaterialDesignTheme.MahApps.RangeSlider.xaml" />
+        <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.MahApps;component/Themes/MaterialDesignTheme.MahApps.TextBox.xaml" />
         <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.MahApps;component/Themes/MaterialDesignTheme.MahApps.WindowCommands.xaml" />
     </ResourceDictionary.MergedDictionaries>
 
     <Style TargetType="{x:Type controls:NumericUpDown}" BasedOn="{StaticResource MaterialDesignNumericUpDown}" />
     <Style TargetType="{x:Type controls:RangeSlider}" BasedOn="{StaticResource MaterialDesignRangeSlider}" />
+    <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource MahApps.MaterialDesignTextBox}" />
 
     <Style x:Key="MahApps.Styles.NumericUpDown.DataGridColumn"
            BasedOn="{StaticResource MaterialDesignNumericUpDown}"

MaterialDesignThemes.MahApps/Themes/MaterialDesignTheme.MahApps.TextBox.xaml

@@ -0,0 +1,12 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.ValidationErrorTemplate.xaml" />
+        <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.TextBox.xaml" />
+    </ResourceDictionary.MergedDictionaries>
+
+    <Style x:Key="MahApps.MaterialDesignTextBox" TargetType="TextBox" BasedOn="{StaticResource MaterialDesignTextBox}">
+        <Setter Property="mah:TextBoxHelper.IsMonitoring" Value="True" />
+    </Style>
+</ResourceDictionary>