Update code (minor changes)

Author: sergepilipchuk

CS/MainWindow.xaml

@@ -10,6 +10,9 @@
                     <DataTrigger Binding="{Binding Path=Content.ErrorContent, RelativeSource={RelativeSource Self}, Converter={StaticResource ErrorContentToErrorTypeConverter}}" Value="Critical">
                         <Setter Property="ContentTemplate" Value="{DynamicResource {dxet:ErrorTypesThemeKeyExtension ResourceKey=Critical}}" />
                     </DataTrigger>
+                    <DataTrigger Binding="{Binding Path=Content.ErrorContent, RelativeSource={RelativeSource Self}, Converter={StaticResource ErrorContentToErrorTypeConverter}}" Value="Warning">
+                        <Setter Property="ContentTemplate" Value="{DynamicResource {dxet:ErrorTypesThemeKeyExtension ResourceKey=Warning}}" />
+                    </DataTrigger>
                     <DataTrigger Binding="{Binding Path=Content.ErrorContent, RelativeSource={RelativeSource Self}, Converter={StaticResource ErrorContentToErrorTypeConverter}}" Value="Information">
                         <Setter Property="ContentTemplate" Value="{DynamicResource {dxet:ErrorTypesThemeKeyExtension ResourceKey=Information}}" />
                     </DataTrigger>

CS/MainWindow.xaml.cs

@@ -51,15 +51,17 @@ void RaisePropertyChanged(string property) {
         string IDataErrorInfo.Error {
             get { return GetError(); }
         }
+
         string GetError() {
             if (string.IsNullOrEmpty(TestString))
-                return "ErrorType=Critical;ErrorContent=empty";
+                return "ErrorType=Critical;ErrorContent=The value is not provided. Please enter a value";
             if (TestString.Length < 3)
-                return "ErrorType=Critical;ErrorContent=error";
+                return "ErrorType=Warning;ErrorContent=The value is less than 3 characters. Please enter at least 5 characters";
             if (TestString.Length < 5)
-                return "ErrorType=Information;ErrorContent=warning";
+                return "ErrorType=Information;ErrorContent=The value is less than 5 characters. Please enter at least 5 characters";
             return string.Empty;
         }
+
         string IDataErrorInfo.this[string columnName] {
             get {
                 if (columnName == "TestString")