Whilst testing our Windows Store app developed for Windows 8/8.1 on Windows 10 we've discovered that tapping on a textbox doesn't display the touch keyboard.
I've created a new project to test this in using a textbox defined with the following XAML
<TextBox x:Name="testTextBox" HorizontalAlignment="Left" Margin="469.901,314.495,0,0" InputScope="Number"
TextWrapping="Wrap" Text="" VerticalAlignment="Top" Height="37" Width="383" RenderTransformOrigin="0.5,0.5"
UseLayoutRounding="False" d:LayoutRounding="Auto">
</TextBox>
It seems InputScope="Number" is having an effect because if I manually open the touch keyboard it is displaying the number keyboard however I can't get the touch keyboard to open when the textbox gets focus (ie. it is tapped on).
I have also tried setting this value through code as follows:
InputScope scope = new InputScope();
InputScopeName scopeName = new InputScopeName();
scopeName.NameValue = InputScopeNameValue.Number;
scope.Names.Add(scopeName);
testTextBox.InputScope = scope;
UPDATE I've found there is a setting Tablet Mode which when turned on the touch keyboard does launch as I expected.
It turns out that the touch keyboard will only automatically display if the device is in Tablet mode.