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I went to my local Hobby Shop and they introduced me to the Tactic radios and I like the form and price. I have had an APM 2.6 for some time and thought why not get it going. when it came tome to set up the switch to control the flight modes i ran into some issues. I could not find a good source of information to set my system up. It looked like I may have made a misguided choice in radios as hardly any in the forums were using the Tactics let alone the TTX850. I found a few articles that kind helped but it meant me using up two RC channels to get the mixing I was looking for. I found some help on the rcgroups site that helped. I came across an article on the DIYDrones forums that seem to get me started.  I loosely followed the Specrtum DX8 2 switch mix from DIYDrones . Below is what I came up with and will allow you to use just one channel and mix two switches (one 2 position and one 3 position) to get all six flight modes on a Tactic TTX850.

Here is my set up:

CH 6 >Reversed >Travel 85% 85%
CH6 assigned to SW H (Offset 0%, Speed 100%)

Mix 1: CH6 -> CH6 
Rate L: +0%
R: +0%
Offset: +0%
CTRL: SW G 0 Pos (L(1), M(0), H(0))

Mix 2: CH6 -> CH6 
Rate L: -53%
R: -59%
Offset: +0%
CTRL: SW G 1 Pos (L(0), M(2), H(0))

Mix 3: CH6 -> CH6 
Rate L: -80%
R: -80%
Offset: +0%
CTRL: SW G 2 Pos (L(0), M(0), H(2))

This will give you the following Flight Modes (FM). This setup allows you to cycle through the flight modes is a sequential switch order with both switches starting at the "0" position. FM 2 and 3 are entered by flipping SW G (3 Position Switch) to position 1 and 2 respectively. To continue down the FMs you flip SW H (2 Position Switch) to position "1" and that will enter FM 4. For FM 5 flip SW G to position "1". When SW G is flipped to position "0" it will enter FM 6.

Switch 1-Position/ Switch 2 -Position = Flight Mode

H-0/G-0 = FM 1
H-0/G-1 = FM 2
H-0/G-2 = FM 3
H-1/G-2 = FM 4
H-1/G-1 = FM 5
H-1/G-0 = FM 6