WPF: Binding to a custom class "Cannot find source for binding" - wpf

Question

Did this:
public class myClass : INotifyPropertyChanged
{
public bool? myFlag = false;
public bool? MyFlag
{
get { return myFlag; }
set
{
myFlag = value;
OnPropertyChanged("MyFlag");
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string name)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
Declared a test variable myClass in the Window1 class:
public partial class Window1 : Window
{
myClass test;
public Window1()
{
InitializeComponent();
test = new myClass();
}
}
Here's an example XAML file:
<Window x:Class="WpfApplication5.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300" IsEnabled="{Binding ElementName=test, Path=MyFlag}">
<Grid>
<Button>You shouldn't be clicking me</Button>
</Grid>
</Window>
The window isn't disabled, and the debugger is showing me that message.
What am I missing?

Answer 1

The ElementName property of the Binding is meant to target other elements in xaml, not properties/fields of the object. The common way to do what you're trying to accomplish is to assign an instance of myClass to the Window's DataContext property:
public partial class Window1 : Window
{
//myClass test;
public Window1()
{
InitializeComponent();
this.DataContext = new myClass(); //test = new myClass();
}
}
And then your binding will look like this: IsEnabled="{Binding Path=MyFlag}".
If you actually wanted to bind to a property on the Window itself, you would use a binding like this:
IsEnabled="{Binding RelativeSource={RelativeSource Self}, Path=test.MyFlag}"