Cell Merge Question

I want to display adjacent rows of merged cell ranges without any grid lines between the rows but I have been unable to come up with a satisfactory solution. I suspect that this is something that is not supported but I thought I would check here before placing a feature request.

The situation I am trying to address is illustrated by dropping an advstringgrid on the form and then executing this code in the main form OnCreate handler:

The result is that there is a horizontal gridline separating the merged sections of the two rows. I understand the logic of why there is a line but it would be nice to be able to remove the gridline. Alternatively, it would be nice to be able to create non-rectangular merges.

One workaround I have tried is to set the merged cells to the gridline color but that is not very visually pleasing.

Thank you

The instructions here are to merge cells 2,2 and 2,3 and also 2,3 and 2,4 and 2,5 so this is what the grid does.
It is currently not possible to merge non-rectangular areas.