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    <p>Since you're probably looking to bind the IsEnabled property of the button based on a string, try making a converter for it.</p> <p>Ie... <pre><code> &lt;StackPanel&gt; &lt;StackPanel.Resources&gt; &lt;local:SomeStringConverter mystringtoboolconverter /&gt; &lt;/StackPanel.Resources&gt; &lt;Button IsEnabled="{Binding ElementName=mytree, Path=SelectedItem.Header, Converter={StaticResource mystringtoboolconverter}}" /&gt; &lt;StackPanel&gt; </code></pre></p> <p>and the converter:</p> <pre> <code> [ValueConversion(typeof(string), typeof(bool))] class SomeStringConverter : IValueConverter { public object Convert( object value, Type targetType, object parameter, CultureInfo culture ) { string myheader = (string)value; if(myhead == "something"){ return true; } else { return false; } } public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture ) { return null; } } </code> </pre> <p>EDIT: Since the OP wanted to bind to a variable, something like this needs to be done:</p> <pre> <code> public class SomeClass : INotifyPropertyChanged { private string _somestring; public string SomeString{ get{return _somestring;} set{ _somestring = value; OnPropertyChanged("SomeString");} } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string propertyName) { if (this.PropertyChanged != null) { this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } } </code> </pre> <p>Then, change the above binding expression to:</p> <pre> {Binding Path=SomeString, Converter={StaticResource mystringtoboolconverter}} </pre> <p>Note, you MUST implement INotifyPropertyChanged for your UI to be updated.</p>
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    1. COThanks for the reply. I'm getting an error in my xaml on this line: <Grid.Resources> <local:StringToBoolConverter stringToBoolConverter /> </Grid.Resources> "The type local:StringToBoolConverter was not found." StringToBoolConverter is the name of my converter class. Do I need to qualify it with a namespace?
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    2. COGot it. Namespace issue in the xaml.
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    3. COHmm. I think this is incomplete; it looks like there there needs to be some sort of event raised by the member property that the Button responds to, so when the member property is changed, the button's Enabled state will change.
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