How to get a WPF Toolbar to bind to a collection in my VM without using expander

Answer 1

There is a bug in the toolbar, if you re-size the window, the problem goes away.

The solution is using another control, like:

public class WorkaroundToolBar : ToolBar
{
    private delegate void IvalidateMeasureJob();

    public override void OnApplyTemplate()
    {
        Dispatcher.BeginInvoke(new IvalidateMeasureJob(InvalidateMeasure), 
                                     DispatcherPriority.Background, null);
        base.OnApplyTemplate();
    }
}

Check out this thread for more info

Answer 2

You can also set the height of the toolbar in the xaml to a reasonable value which has worked for me.