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    copied!<p>I cannot see whole template but this looks a bit overcomplicated. I assume you're trying to achieve watermark text. For hint use box standard <a href="http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.tooltip.aspx" rel="nofollow"><code>ToolTip</code></a> property, which by default will display your text in a popup when hover your <code>TextBox</code> but this behaviour can be disabled and <code>ToolTip</code> property reused. You can either create reusable <code>Style</code> - which I prefer - for <code>TextBox</code>, something like this:</p> <pre><code>&lt;Window ...&gt; &lt;Window.Resources&gt; &lt;BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/&gt; &lt;Style TargetType="{x:Type TextBox}" x:Key="WatermarkTextBoxStyle"&gt; &lt;Setter Property="ToolTipService.IsEnabled" Value="False"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type TextBox}"&gt; &lt;Border Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" BorderThickness="1" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}"&gt; &lt;Grid&gt; &lt;TextBlock Margin="5,0,0,0" Text="{TemplateBinding ToolTip}" Visibility="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Text.IsEmpty, Converter={StaticResource BooleanToVisibilityConverter}}" Opacity="0.5"/&gt; &lt;ScrollViewer Name="PART_ContentHost"/&gt; &lt;/Grid&gt; &lt;/Border&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;TextBox ToolTip="watermark text" Style="{StaticResource WatermarkTextBoxStyle}"/&gt; &lt;/Window&gt; </code></pre> <p>or, if it's a one-off thing, then do you can do something like this without any <code>Style</code> or <code>Template</code>:</p> <pre><code>&lt;Grid Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"&gt; &lt;TextBlock Margin="5,0,0,0" Text="watermark text" Opacity="0.5" Visibility="{Binding ElementName=myTextBox, Path=Text.IsEmpty, Converter={StaticResource BooleanToVisibilityConverter}}" /&gt; &lt;TextBox Name="myTextBox" Background="Transparent" /&gt; &lt;/Grid&gt; </code></pre>
 

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