Yup- a mix of whats been mentioned a lot here is what I have found works best for me.

A few wraps of electrical tape where the first half is pulled tight and then the last full wrap is not tensioned.
Then a few wraps of self fusing tape where the first half is pulled tight(that stuff stretches) and then the last full wrap is not tensioned.
Both the electrical tape and silicone tape wrap to the edge of the bar tape and not over it. All 3 tapes end at the same point and along the same line.

Gives a clean and square look and bar tape never moves.