Question

If I now look at the problem this way. The XAML code is as follow:

<toolkit:PerformanceProgressBar 
                        x:Name="performanceProgressBar" 
                        Margin="0,-40,0,0" 
                        IsIndeterminate="true" 
                        Visibility="{Binding ShowProgressBar}" 
                        Grid.ColumnSpan="2"/>

and the code behind is as follows:

private bool ShowProgressBar
{
    get { return !App.ViewModel.IsDataLoaded; }
}

The progress bar does not disappear after the data has been loaded, i.e. ShowProgressBar is false.

Answer 1

I think you can do it this way:

IsIndeterminate="{Binding ShowProgressBar}"