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WPF application showing task bar at times though window set to fullscreen

I've written an installer with a WPF UI. During the installation of a pre-requisite, the full screen WPF ui loses focus and task bar appears for some time. Currently below is how my window element looks.
<Window x:Class="CustomBA.MainView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:resources="clr-namespace:KubeCustomBA.Resources"
mc:Ignorable="d"
Title="Installer" Width="1431" MinWidth="400" Height="588.9" MinHeight="300" ResizeMode="NoResize" WindowState="Maximized" ShowInTaskbar="False" Topmost="False" WindowStartupLocation="CenterOwner" WindowStyle="None" Background="#FF222222">
How can I avoid it from losing focus and showing the task bar? Any help would be much appreciated.

Grid control can't cover the whole page and leaves a space at the top

I have a default grid control defined in xaml:
<Page
x:Class="App.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid>
</Grid>
</Page>
And this grid does not start from the top of the page as you can see from the picture below:
One way to achieve this is to set a negative margin like this:
<Page
x:Class="App.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid Margin="0,-26.667,0,0">
</Grid>
</Page>
So it will look like in this picture:
However, I've watched some of Bob Tabor's videos like this one and all of his default controls starts right from the top of the page.
What is the problem here and how can I solve it without setting a negative margin?

Well status bar is there by default.
You have 2 options:
Hide it -> Hide Status bar in Windows Phone 8.1 Universal Apps
put your content under it:
var applicationView = Windows.UI.ViewManagement.ApplicationView.GetForCurrentView();
applicationView.SetDesiredBoundsMode(Windows.UI.ViewManagement.ApplicationViewBoundsMode.UseCoreWindow);
You may wish to read this for additional info:
http://blogs.msdn.com/b/amar/archive/2014/05/12/status-bar-in-windows-phone-8-1.aspx

8.1 Universal App. Getting user input from the Grid or Page (KeyDown event)

I'm quite new to using XAML and was wondering if it is possible to get the users keyboard input directly from the Grid or the Page by grabbing a character at a time?
I've been trying using the KeyDown event which I put on both the grid and the page but the only way either seems to fire is if enter is pressed or if it is tabbed over.
I was wondering if I possibley need to set focus on them to capture the input?
<Page
x:Class="Test.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:s="http://schemas.microsoft.com/netfx/2007/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Test"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" KeyDown="Page_KeyDown" Loaded="Page_Loaded"
>
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" KeyDown="Grid_KeyDown">
</Grid>
Any thoughts on how this can be achieved would be greatly appreciated.
Thanks

WPF Window not having title named correctly

I have a WPF application that has the title set to "Pioneer Document Handling Viewer" within the xaml:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mt="clr-namespace:DocumentHandlingTouch" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="DocumentHandlingTouch.MainWindow"
Title="Pioneer Document Handling Viewer" Height="909" Width="1020" WindowState="Maximized"
Icon="default_document.ico" xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit">
But it shows up with an older title: when I run it.
I've tried a clean rebuild. Reopening the project, etc and the title still doesn't change.
Why would the XAML be different than the runtime title?

wpf borderless window focus not firing

I have the following WPF window definition but the focus/lost focus events are not firing when I click away from the application, any ideas?
<Window x:Class="BevaClient.windowMain"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:l="clr-namespace:BevaClient"
xmlns:forms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
Title="VPN Tool" Height="500" Width="370"
Focusable="True"
WindowStyle="None"
ResizeMode="NoResize"
Topmost="True"
Style="{StaticResource defaultWindow}"
Loaded="Window_Loaded"
GotFocus="Window_GotFocus"
LostFocus="Window_LostFocus">
I have tried setting topmost to false to see if this was the issue but it makes no difference.
Any advice on this issue would be very much appreciated.
Thanks,
David

Hook to Activated and Deactivated events instead.