Templates was added

Infrastructure/UI/Styles.xaml

@@ -11,6 +11,14 @@
     <converters:Length x:Key="LengthConverter"/>
     <converters:Area x:Key="AreaConverter"/>
 
+    <Style TargetType="TextBox" x:Key="ValidatedError">
+        <Style.Triggers>
+            <Trigger Property="Validation.HasError" Value="True">
+                <Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}"/>
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+
     <Style TargetType="Shape" x:Key="ShapeStyle">
         <Setter Property="Fill">
             <Setter.Value>