Few characters not displayed in WPF Controls

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C#

WPF

In my WPF application, I am unable to see few characters as the content of WPF controls.

For ex: I have defined a Textblock and its text (a bullet mark) as

<TextBlock Text="&#8226;&#160;&#160;"/>

and a button and its content(a ? sign) as

<Button Content="?" />

However, in few of the users machines these symbols are not displayed. It is displayed just blank.

Does anybody have any idea why this is not working fine in only few machines. We are using .NET Framework 3.5 version.

Please help resolve this issue.

Thanks,
RBK