Tap event missing on Text annotation and image annotations for windows phone 8.1.

[objorke]

From oxyplot: oxyplot/oxyplot#966

IF BUG, INCLUDE THIS PART:

Steps to reproduce

1. Tap event missing on Text annotation and image annotations
2. i try for test annotation and image annotation both i don't find tap event for both.

Platform:
.NET version:

Expected behavior

Tap event needs to be defined separately for both so actions can be performed on tap of both type of annotations.

Actual behavior

Mouse events working fine for web but mobile app not. one more thing i want to tell you about text annotation. I add two text annotations on plot and give one's text is "+" and the another's text is "-".
But both of the annotations take different height and width.