Shape twin so EVIL!!!!!!

[maydays]

I need 2 make a simple shape twin, with one triangle and just move one of the corners and i only want that specific corner to move but for some resons flash moves tree points. I have made an example of what i am talking about.

Anyone have any idea about how to make this work, i have tryed all i know but still nothing.?

And one more thing, can i add an anchor point (vertex) on an straight line??