Table Column Toggle colspan problem

Table Column Toggle colspan problem

I have a table enhanced with Column Toggle widget. I need to have some cells merged within the row, but in some rows it can be merged, in some doesn't. See the example  with the actuall problem included (turn off either column "Header 1-2" or "Header 5").

The problem turns out during the initialization as the cells in the body are decorated with wrong class " ui-table-priority-#". This way I actually can't make any workaround unless I rewrite the whole widget.

Is there any possibility to fix this soon?