Trigger for custom dependency properties in Style - wpf

Question

The problem
I defined a reusable control, MyControl, that extends a TextBox.
I want to set a Trigger to one of its dependency properties.
So I added a style to it, with Triggers.
But if I set the TargetType of the Style to MyControl, I get a XAML warning that 'MyControl' TargetType does not match type of element 'TextBlock'.
And if I set it to TextBlock, I get a compilation error that The member "MyDependencyProperty" is not recognized or is not accessible..
How can I define this style with the triggers?
Sample
C# code-behind
namespace UserControls.Local
{
public partial class MyControl : TextBlock
{
#region Trogdor
public static readonly DependencyProperty TrogdorProperty = DependencyProperty.Register(
"Trogdor", typeof (bool), typeof (MyControl), new PropertyMetadata(default(bool)));
public bool Trogdor
{
get { return (bool) GetValue(TrogdorProperty); }
set { SetValue(TrogdorProperty, value); }
}
#endregion
public MyControl()
{
InitializeComponent();
}
}
}
XAML
<TextBlock
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:UserControls.Local"
mc:Ignorable="d"
Text="BOOP!"
x:Class="UserControls.Local.MyControl">
<TextBlock.Style>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="Foreground" Value="Blue"/>
<Style.Triggers>
<Trigger Property="Trogdor" Value="True">
<Setter Property="Foreground" Value="DeepPink"/>
</Trigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>

Answer 1

The solution I found was to "fully qualify" the dependency property on the binding:
<Trigger Property="local:MyControl.Trogdor" Value="True">

Answer 2

Not sure if you are still looking for a solution, but the answer in this thread worked for me, while yours didn't.
It uses a DataTrigger with a binding on the root element, instead of a Trigger:
<DataTrigger Binding="{Binding Path=Highlight, RelativeSource={RelativeSource AncestorType={x:Type Elements:DataElement}}}" Value="True">
<Setter Property="Control.Background" Value="{DynamicResource EntryBoxHighlightBackground}"/>
</DataTrigger>
With your solution, I press the button and the value of the variable changes but the style trigger doesn't apply the changes, like it was not informed of the change in the variable.