Ok, did some research and hopefully this is correct. It appears that the Flip (and with it the receiver with it) can be powered from any of the motor pins. I used some of the following links to come to that conclusion, 1st link directions for Flip installation and second read the comments.
If you want to power everything from the UBEC pull the power wires from all of your ESC (you can also remove the ground and just use signal wires) then wire it up as I have in the picture and it should power your servo and the FC board and your receiver.
http://www.lynxmotion.com/images/document/PDF/lynxmotion-uav-electronics-guide-v10.pdf
http://flitetest.com/articles/flip-mwc-flight-controller-1-5-tricopter-setup
If you want to power everything from the UBEC pull the power wires from all of your ESC (you can also remove the ground and just use signal wires) then wire it up as I have in the picture and it should power your servo and the FC board and your receiver.
http://www.lynxmotion.com/images/document/PDF/lynxmotion-uav-electronics-guide-v10.pdf
http://flitetest.com/articles/flip-mwc-flight-controller-1-5-tricopter-setup