Missing Drill symbols on the board

Hello,

I have a situation. I have prepared the PCB layout with no issues but the point i stuck on is, i dont see the drill symbols on the prepared board..

e.g I have a through hole pin connectors on my board, i can see the pad stacks, thermal relief and all other things which are there in the footprint and PAD, but only thing I am missing is the DRILL SYMBOL. 

I checked with the footprint and the PAD, it is there but on the board i can not see it.

I tried changing all the different color options (thinking that its hiding behind) but still not able to  reach to the solution.

If anyone has an idea please help me.....

thank you,