And then ask a question about columns.
Because tags are oriented towards the people that will answer the question, and google searching is sufficient, I see tags as categories, so I would retag as:
That way people with wpf experience, and people with grid experience can help. You'd likely get more help from wpf programmers, but maybe someone with some Winforms grid experience pickup something others don't notice.
In my opinion, you shouldn't assign multiple tags within the same topic with varying levels of specificity. The tags you assign should be one per topic with the exact specificity you need to answer your question.
Another example of this way of tagging:
I've started to suggest that people do this in comments, and have even edited questions in this manner.
Before I continue!
Am I correct?
See my example edit