Setting the placement target when opening the context menu.
Merge pull request #216 from Taldoras/master

Setting the placement target when opening the context menu.
Revert "Setting the placement target when opening the context menu."

This reverts commit 4875b0371175f80c98b86c114e1ff99e291164e4.
Merge branch 'develop'
Merge branch 'master' of https://github.com/oxyplot/oxyplot into develop