Initial commit

Style.xaml

@@ -0,0 +1,12 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Style TargetType="{x:Type TextBox}">
+        <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>
+</ResourceDictionary>