A 'Binding' can only be set on a DependencyProperty of a DependencyObject

Question

From a custom control based on TextBox, I created a property named Items, in this way:

public class NewTextBox : TextBox
{
    publ         


        

Answer 1

I had the (runtime + designtime) message:

An unhandled exception of type 'System.Windows.Markup.XamlParseException' occurred in PresentationFramework.dll

Additional information: A 'Binding' cannot be set on the 'Property' property of type 'Trigger'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

Where I was smart enough to define a Trigger on a VM property..

// incorrect.. cannot have Trigger for VM property

  

Which should of course be a datatrigger (which uses Binding instead of Property)

Triggers are typically for Controls (Button, TextBox, FrameworkElement etc.) properties.