My Silverlight app doesnt show changes

Question

Hello there.

It's my first time with SL (but not WPF). Im learning PRISM watching the great videos of MTaulty: http://channel9.msdn.com/blogs/mtaulty/prism--silverlight-part-1-taking-sketched-code-towards-unity

So far so good, I'm with the last video and I'm doing the same things He does in my VS. I'm using SL4 & mvc2 web & prism for sl4.

I Found a problem and I don't know what is going on.

My SL application itself doesnt show any changes. I have a basic shell:

<Grid x:Name="LayoutRoot" Background="Azure">
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="2*" />
    </Grid.ColumnDefinitions>
    <ctls:GridSplitter Grid.RowSpan="2" HorizontalAlignment="Right"
                       VerticalAlignment="Stretch" Width="2"
                       Background="Black" />
    <ctls:GridSplitter Grid.Column="1"
                       HorizontalAlignment="Stretch" VerticalAlignment="Bottom"
                       Height="2" Background="Black" />

    <Border Background="SkyBlue" CornerRadius="3"
            Margin="5" Grid.RowSpan="2">
        <ContentControl rgn:RegionManager.RegionName="FolderSelectionRegion"
                        HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                        HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" />
    </Border>
    <Border
        Background="SkyBlue"
        CornerRadius="3"
        Margin="5"
        Grid.Column="1">
        <ContentControl
            rgn:RegionManager.RegionName="MailSelectionRegion"
            HorizontalAlignment="Stretch"
            VerticalAlignment="Stretch"
            HorizontalContentAlignment="Stretch"
            VerticalContentAlignment="Stretch" />
    </Border>
</Grid>

The thing is, I registered a View in the first regionManager, perfect, I registered a second view but it doesnt show... Ok, some bug in someplace... but no.

I realized that the border for the second regionManager is not showing up, ok. I commented the line that register the view (the view is working) and the view is still showing up. I commented the bootstrapper, deleting it from Application_Startup, nothing the view is still showing up (not possible, there is no way that my app knows how to execute the Shell, is all commented out).

In short, I'm sure if I Delete 3 files, the app is still working... I cleaned the solution, deleted the .xap files from the ClientBin... Nothing, the app is still showing up the view and so on. On other words, the app is not reflecting changes on the code.

What's going on?

Thank you.