Font not changing to Bold or Italics

All,

I have Installed Burmese Font in windows 7 called "Zawgyi-One". I can see the font in designer and able to copy paste Burmese text. The problem is the text not changing to Bold/Italics even after the Bold/Italics button is selected.

Thanks In Advance

PS: If I try the text in MS word, It is changing to bold so the system has the font.