How to display software keyboard on Windows Phone 8.1

Windows Phone
1

I have placed TextBox control on GamePage.xaml.
It is visible but not responsive, when I touch it nothing happens.
The goal is to implement default WP8.1 behavior when user touch the TextBox to show the Keyboard.

GamePage.xaml:

<SwapChainBackgroundPanel
    x:Class="X.GamePage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:X"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    
    <Grid>
        <TextBox VerticalAlignment="Bottom" />
    </Grid>
</SwapChainBackgroundPanel>

Any ideas what is the problem?

2

I have the same issue. I created an universal app project with a textbox in the gamepage.xaml but when I run the Windows phone project is not possible enter any text on it. In the Windows 8.1 project works fine with a physical keyboard. Some one can help please?