I am having trouble with

Limit of $\displaystyle 2x+iy^2 $as z->2i

i set it up at lim 2x as x->0 + i lim y^2 as y->2. so i get 4i as my limit but when i plug 2i directly i get -4i... is this right because of how the complex plain is defined?? or am i completely wrong thinking the limit is 4i? any help would be awesome!