Should use regular Delete action (but labelled "Remove" if possible).
*** Issue 172976 has been marked as a duplicate of this issue. ***
Integrated into 'main-golden', will be available in build *201004040201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Jesse Glick <firstname.lastname@example.org>
Log: #160277: Standardize UI for Remove [Instance] action