Here is my TextBlock
s
<StackPanel Orientation="Horizontal" Margin="0,3,0,0">
<TextBlock Text="6 or more characters, at least one letter and a number, " FontFamily="Segoe UI" Foreground="#000000" FontSize="13"/>
<TextBlock Text="no symbols" FontFamily="Segoe UI" Foreground="#000000" FontSize="13"/>
</StackPanel>
And here is the output (screen shot)
Why TextBlock
trims ending spaces? However it works fine when I give leading spaces.
It looks like xml:space="preserve"
should do the trick (see Preserving Whitespace in XAML) but that doesn't seem to be working in a Windows Store app (it does in WPF).
If you use the non-breaking space character  
it does work
<TextBlock Text="6 or more characters, at least one letter and a number,       " ....
I suppose you could try building a converter on the Text
property to check for trailing spaces and replace with non-breaking spaces - presuming the truncation that's happening doesn't occur too early.