Invoke-WebRequest http://yourwebapp/BackgroundTask/Run
<Grid>
<Grid.RowDefenitions>
<RowDefenition height='*' />
<RowDefenition height='auto' />
<RowDefenition height='*' />
</Grid.RowDefenitions>
<Grid.ColumnDefenitions>
<ColumnDefenition width='*' />
<ColumnDefenition width='auto' />
<ColumnDefenition width='*' />
</Grid.ColumnDefenitions>
<Frame Grid.Row="1" Grid.Column="1" Content="{Binding CurrentPage}"
NavigationUIVisibility="Hidden"
Opacity="{Binding Opacity}"/>
</Grid>