Limiting the number of characters

["Sailaxmi korada " <sai korada xilinx com>]

Hi Folks,

  Can anybody pl. help me of how to limit the number of characters that can
be entered in an editable cell of List Store. I want to restrict the user to
enter a hex value in 0x%4x format (total 6 characters).

 

Thanks for your help in advance

 

Regards

Sai korada