Textbox validation and z-index problems

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C#

XAML

C#4.0

validation

I am fairly new to WPF and I am slowly collecting tips and tricks from across the web to put my project together. I am currently having trouble getting all my ducks in a row for data validation using an AdornedElementPlaceholder.

in my resource file I have

<Style TargetType="{x:Type TextBox}">
        <Setter Property="Validation.ErrorTemplate">
            <Setter.Value>
                <ControlTemplate>
                    <DockPanel LastChildFill="True">
                        <TextBlock DockPanel.Dock="Right" 
                        Foreground="Orange"
                        FontSize="12pt" 
                        ToolTip="{Binding ElementName=MyAdorner, 
                                          Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">***
                        </TextBlock>
                        <Border BorderBrush="Red" BorderThickness="2">
                            <AdornedElementPlaceholder Name="MyAdorner"/>
                        </Border>
                    </DockPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="Validation.HasError" Value="true">
                 <Setter Property="Background" Value="MistyRose"/>
            </Trigger>
        </Style.Triggers>
    </Style>

and this is the textbox I'm working with currently to make things work

<TextBox Grid.Column="2" Height="23" Name="txtRefreshTime" Width="60" MaxLength="3">
    <TextBox.Text>
        <Binding FallbackValue="59" RelativeSource="{RelativeSource Self}" Path="Text">
            <Binding.ValidationRules>
                <val:StringRangeValidationRule
                    MinimumLength="1"
                    ErrorMessage="Must have a numeric value."/>
                <val:NumericInputValidationRule
                    IsAType="intType"
                    ErrorMessage="Must be a number of seconds."/>
                <val:NumericRangeValidationRule
                    MinimumValue="5"
                    MaximumValue="900"
                    ErrorMessage="Value must be between 5 and 900 seconds (15 minutes)."/>
            </Binding.ValidationRules>
            </Binding>
    </TextBox.Text>
</TextBox>

Everything works exactly how I want it to EXCEPT once the validation takes place and an error is found I can't click and set focus on the textbox. I can tab to it but I can't click on it. I downloaded an example from here and the code doesn't show anything different and it works just fine. Any ideas on what I have wrong or a way to fix the problem?


I also have used this piece into the resource file as a replacement for the above. It is similar to the above bit of style and it also 'almost' works, but the tooltip doesn't show.

<Style TargetType="{x:Type TextBlock}">
    <Setter Property="Validation.ErrorTemplate">
        <Setter.Value>
            <ControlTemplate>
                <AdornedElementPlaceholder Name="controlWithError" />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="Validation.HasError" Value="true">
            <Setter Property="Foreground" Value="Red"/>
            <Setter Property="Background" Value="MistyRose"/>
            <Setter Property="ToolTip"
            Value="{Binding RelativeSource={RelativeSource Self},
            Path=(Validation.Errors)[0].ErrorContent}"/>
        </Trigger>
    </Style.Triggers>

And as requested some of the validation code

public class StringRangeValidationRule : ValidationRule
    {
        private int _minimumLength = -1;
        private int _maximumLength = -1;
        private string _errorMessage;

        public int MinimumLength
        {
            get { return _minimumLength; }
            set { _minimumLength = value; }
        }

        public int MaximumLength
        {
            get { return _maximumLength; }
            set { _maximumLength = value; }
        }

        public string ErrorMessage
        {
            get { return _errorMessage; }
            set { _errorMessage = value; }
        }

        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            ValidationResult result = new ValidationResult(true, null);
            string inputString = (value ?? string.Empty).ToString();
            if (inputString.Length < this.MinimumLength ||
                   (this.MaximumLength > 0 &&
                    inputString.Length > this.MaximumLength))
            {
                result = new ValidationResult(false, this.ErrorMessage);
            }

            return result;
        }
    }