[gtkmm] To select particular file types

[Ramachandra Putti <ramachandrap dpsl net>]

Hi,

I am working on Gtkmm 2.0 on RedHat linux 7.3 and gcc 2.6.

My current application needs to select a file externally, I am using 
file selection dialog box, what i want is, file selection dialog box 
should display, particular files i.e. only tiff & jpg and not the txt 
files. i.e. it should be specific to file.
    
Is there any way to accomplish these, which property I need to set.

Regards
Ramachandra