Drag and Drop onto a cell of a cube grid

I am trying to create a two dimension matrix editor. That is I want to show a table with n rows and m columns, where each cell is individually addressable.

I have been using a CubeGrid successfully for this, and have used setEditorCustomizer to allow for individual cells to be edited.

I haven't been able to drag and drop onto an individual cell.

Is this functionality supported? I haven't been able to find any example showing this behavior.

Thanks for the help.

Chris