Question: I have a problem with a WPF application. Somehow it seems that two (out of several) bindings in my WPF control are not immediately applied. When I look into the visual tree with [Snoop](http://snoopwpf.codeplex.com/), the binding is suddenly applied and everything works fine. 

What can be the reason for that?

The XAML code is here: 

```
<Grid Grid.Column="1" Margin="5">
    <m:Map ZoomLevel="12" Center="{Binding MapCenter, Mode=TwoWay}">
        <m:Map.CredentialsProvider>
            <m:ApplicationIdCredentialsProvider ApplicationId="???"/>
        </m:Map.CredentialsProvider>

        <m:Pushpin Location="{Binding Station.Location, Mode=TwoWay, Converter={StaticResource debugConverter}}" />
    </m:Map>
    <Button Command="{Binding CenterOnAddressCommand, PresentationTraceSources.TraceLevel=High, Converter={StaticResource debugConverter}}"
        Content="Adresse zentrieren" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="0,0,0,20" />
</Grid>

```

The binding of the `Map.Center` property works and the other two bindings (on Pushpin and Button) don't. The Map control is from the Bing Maps WPF Control.

**EDIT:** 
After some further investigation I tried removing the binding to the Map.Center property and then everything works (well except centering the map on a certain position). How can this be?

Thanks in advance!

Answer: 
Two tips:

1. Try upping the verbosity of the WPF messages displayed in the Output window. You can do this by going to `Tools > Options > Debugging > Output Window > WPF Trace Settings` and changing `Data Binding` to something like `All`.
2. Add an `UpdateSourceTrigger` attribute to the bindings that are failing - it may be that the bindings aren't being told to update. Maybe Snoop triggers application-wide binding updates.

I hope that helps you find the cause of your problem.
What about the m:Map control? Is that honoring the values when it is being initialized? ie if you give a fixed value for property is that working.

Try [Reflector](http://.NET%20Reflector%3a%20Decompiler%20and%20Assembly%20Browser%20%7C%20.NET%20Reflector%20www.reflector.net/) to verify the code of the Map control.