[Q] Need Help! Call waiting pop up annoyance, how to disable it?

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http://forum.xda-developers.com – When I try to answer a call when I'm already in a call this pop up window come up. It askes me if I want to end the current call or place it on hold. It's especially annoying when I'm driving. Swiping the screen is already confirming I want to accept the call, why do I have to double confirm. The pop up box is so small and when I have my phone mounted it's hard to aim the selection. Anyone know how to disable this annoying popup? Probably not too hard to tell I'm new to touchwiz. I tried searching doesn't seem like anyone else find this annoying. (HowTos)