Drawing Gantt chart task list grid lines

There seems to be no way via a Gantt chart's Appearance properties to draw/show/color the grid lines of a Gantt chart's task list. The closest solution I found is to set GanttChart.TaskList.NodesAppearance.Stroke.Color to a color and
GanttChart.TaskList.NodesAppearance.Stroke.Stroke.Kind to gskSolid, but this will only draw the horizonzal lines with the restriction that it won't draw the complete horizontal lines in the first column with the collapse icon and indent for the wbs number.

For the moment you can set the vertical column lines with:
GanttChart.TaskList.NodesAppearance.ColumnStroke

We are looking into adding some customization options for the tasklist as well.
Am I correct that you want to draw the full horizontal line, and not how it is done now with the icon not taken into account?

Yes, the complete horizonal line.