WP7 Popups using resources

Question

Im trying to create my own(custom design) popup for my WP7 application. To put it shortly it should only display bing map with a drawn route and a close button.

I have used the Picker Box by from Alex Yakhnin's Blog. And by his code as a reference i have made my custom xaml file with the following (only basic design, maps and button left behind for now to make this post a bit shorter).

<ResourceDictionary xmlns:my="clr-namespace:Microsoft.Maps.MapControl;assembly=Microsoft.Maps.MapControl" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:Skanetrafiken.Controls;assembly=Skanetrafiken.Controls"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        >
        <Style TargetType="local:MapRouteDialog">
            <Setter Property="Background" Value="{StaticResource PhoneChromeBrush}"/>
            <Setter Property="Width" Value="480"/>
            <Setter Property="Height" Value="800"/>
            <Setter Property="Margin" Value="0"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="local:MapRouteDialog"></ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </ResourceDictionary>

I have this is my own assembly where both namespace and assembly is "Skanetrafiken.Controls", and here i also got my class named "MapRouteDialog" (inherits from ContentControl).

In my class i have pretty much a copy of the following from Alex picker example.

   internal Popup ChildWindowPopup { get; private set; }

private static PhoneApplicationFrame RootVisual
{
    get
    {
        return Application.Current == null ? null : Application.Current.RootVisual as PhoneApplicationFrame;
    }
}

public void Show()
{
    if (this.ChildWindowPopup == null)
    {
        this.ChildWindowPopup = new Popup();

        try
        {
            this.ChildWindowPopup.Child = this;
        }
        catch (ArgumentException)
        {
            throw new InvalidOperationException("This control is already shown.");
        }
    }

    if (this.ChildWindowPopup != null && Application.Current.RootVisual != null)
    {
        this.ChildWindowPopup.IsOpen = true;
    }

    if (RootVisual != null)
    {
        // Hook up into the back key press event of the current page
        ((PhoneApplicationPage)RootVisual.Content).BackKeyPress += new EventHandler<System.ComponentModel.CancelEventArgs>(MapRouteDialog_BackKeyPress);
    }
}

My real problem is that when my method Show() runs, everything runs and nothing crashes but no popup, my normal WP7 page is still visible. I can't figure out whats wrong and right now i can only think of, maybe the resource can't be found or something but have no idea how to fix it if this is the case.

I also has the OnApplyTemplate overriden and on the contructor i set the DefaultStyleKey = typeof(MapRouteDialog).