Display Check Box on Crystal Report Problem!

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C#

CrystalReports

Hi everyone,
I'm showing Check boxes in e Crystal report using formula:

If {Table.IsTeacher} = true then Chr(254) else Chr(168) and font "WingDings"

but when the value is TRUE it doesn't display e checkbox Checked but just e thin rectangle. like "[]".
I'm not getting the solution. if anybody could do it, please let me know.
thanx in advance