Using {TemplateBinding Content} withTextBlock in ControlTemplate

Question

Basically I have a button that I built a control template for. It is currently working but VS 2010 complains about the following line of code in my control template

<TextBlock Text="{TemplateBinding Content}" 
    Foreground="{TemplateBinding Foreground}" 
    x:Name="cContentTextBlock"  />

The control template is for a Button and I have a variety of VisualStates that target this TextBlock.

I can see why VS2010 complains... What if the content isn't actually text? This would cause problems. For me the big deal is that I want to set the Foreground of the text in response to Visual State changes.

Any ideas on how I could accomplish this? (try it, it works... but the vs2010 designer chokes on it)

The following is the entire style:

<Style x:Key="PassiveLinkButton" TargetType="Button">
 <Setter Property="Cursor" Value="Hand" />
 <Setter Property="Template">
  <Setter.Value>
   <ControlTemplate>
    <Grid>
     <vsm:VisualStateManager.VisualStateGroups>
      <vsm:VisualStateGroup x:Name="CommonStates">
       <vsm:VisualState x:Name="MouseOver">
        <Storyboard>
         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="cMouseOverBorder" Storyboard.TargetProperty="BorderBrush">
          <DiscreteObjectKeyFrame KeyTime="0">
           <DiscreteObjectKeyFrame.Value>
            <SolidColorBrush Color="Black" />
           </DiscreteObjectKeyFrame.Value>
          </DiscreteObjectKeyFrame>
         </ObjectAnimationUsingKeyFrames>
        </Storyboard>
       </vsm:VisualState>
       <vsm:VisualState x:Name="Normal"/>
       <vsm:VisualState x:Name="Pressed">
        <Storyboard>
         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="cMouseOverBorder" Storyboard.TargetProperty="BorderBrush">
          <DiscreteObjectKeyFrame KeyTime="0">
           <DiscreteObjectKeyFrame.Value>
            <SolidColorBrush Color="Blue" />
           </DiscreteObjectKeyFrame.Value>
          </DiscreteObjectKeyFrame>
         </ObjectAnimationUsingKeyFrames>
         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="cContentTextBlock" Storyboard.TargetProperty="Foreground">
          <DiscreteObjectKeyFrame KeyTime="0">
           <DiscreteObjectKeyFrame.Value>
            <SolidColorBrush Color="Blue" />
           </DiscreteObjectKeyFrame.Value>
          </DiscreteObjectKeyFrame>
         </ObjectAnimationUsingKeyFrames>
        </Storyboard>
       </vsm:VisualState>
       <vsm:VisualState x:Name="Disabled"/>
      </vsm:VisualStateGroup>
     </vsm:VisualStateManager.VisualStateGroups>
     <Border x:Name="cFocusBorder" 
        BorderThickness="1" 
        BorderBrush="{StaticResource BorderBrush}"
        Margin="2">
      <Grid>
       <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto" />
        <ColumnDefinition Width="*" />
       </Grid.ColumnDefinitions>
       <Border x:Name="cMouseOverBorder" 
        BorderBrush="Transparent" BorderThickness="0,0,0,1" Margin="0 0 0 2">
        <StackPanel HorizontalAlignment="Left">
         <TextBlock Text="{TemplateBinding Content}" Foreground="{TemplateBinding Foreground}" 
            x:Name="cContentTextBlock" Margin="2 2 2 0"
            HorizontalAlignment="Center" />
        </StackPanel>
       </Border>
      </Grid>
     </Border>
    </Grid>
   </ControlTemplate>
  </Setter.Value>

 </Setter>
</Style>

Which would be used like:

<Button Content="Press Me" Style={StaticResource PassiveButtonLink}" />

Answer 1

I would read through this MSDN documentation if you haven't already:

Walkthrough: Customizing the Appearance of a Button by Using a ControlTemplate http://msdn.microsoft.com/en-us/library/cc903963(VS.95).aspx

and if you need to go deeper than that:

Customizing the Appearance of an Existing Control by Using a ControlTemplate http://msdn.microsoft.com/en-us/library/cc189093(VS.95).aspx

Creating a New Control by Creating a ControlTemplate
http://msdn.microsoft.com/en-us/library/cc278064(VS.95).aspx

Answer 2

I had a similar problem. The solution for me was to change my default XML namespace.

The following works in my copy of VS2008, but not in VS2010:

xmlns="http://schemas.microsoft.com/netfx/2007/xaml/presentation"

The following works in both VS2008 and VS2010:

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

By "works", I mean that the WPF designer recognizes the TemplateBinding element.