what i would recommend in this case is to go next to her and order a drink... then when the barman asks you to pay, you point to her and say "she's paying for it".. this will immediatelly get her attention, and when she sais something along the lines of " excuse me? no i'm not paying for it!" then u pay for it while looking at her and saying "Well done" and u walk away.
At this point she will be thinking " what in the world was that about? and why did he just say " Well Done" to me? " Now as you can see, she is already thinking about you and NOT about the other guys staring at her...
Now.. Later on at the club/bar etc keep an eye on her and make sure that u run into her again, and when u do she will 99% look at you and expect you to say something, so this is when u call her over to come closer to you, and when she comes u say " is there a reason u are looking at me funny?" and then she will start to open up and say something like " Well i was wondering what that was about at the bar, and why did u say "well done?"" so u say something like " so you are saying that only guys can buy WOMEN drinks?" and then she will say something like " well no, but that was kinda random and i dont even know you" ( she might also add that its rude) and then u go on to say " well maybe buying me a drink would contribute in getting to know me" (after saying that u give her a little wink) and then she will probably ask " and why did u say well-done?" ( if she doesnt bring it up, then u can, but she probably WILL ) then u say " well the last time i said to the barman that the lady was paying for the drink she did without questioning me or anything, and i dont like that about a girl, i like a woman that will stand up for herself, but after questioning me and standing up for herself, it would still be great if she ended up buying me the drink ( end this sentence with a brief "cute" laugh)
After saying all that, u can start talking about general stuff and even ask her to dance with you... then after spending some time with her u get her number and maybe more
Well anyways... this technique has worked pretty well on MOST of the girls that i have used this on, so give it a try and let me know how it goes
Laterz...