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navigate with tab just select cell and doesn't open it for edit

I have the following grid:

memberGrid = dhxLayout.cells("c").attachGrid();
memberGrid.setImagePath("lib/js/dhtmlX/dhtmlxGrid/codebase/imgs/");
memberGrid.setInitWidths("30,150,150,150,*");
memberGrid.enableMultiselect(true);
memberGrid.enableAutoWidth(true);

    
memberGrid.enableColSpan(true);
memberGrid.enablePaging(true,10,10,"pagingArea",true);
memberGrid.setSkin("light");
memberGrid.setPagingSkin("bricks");
memberGrid.enableDragAndDrop(true);
memberGrid.setDragText("Adresse","Adressen");
memberGrid.enableMercyDrag(true);
memberGrid.enableKeyboardSupport(true);
memberGrid.enableEditTabOnly(true);
memberGrid.enableEditEvents(true,true,true);
memberGrid.init();

when selecting any row in the grid an use tab-button, the cell soen't change in edit mode. i always have to press f2 oder click on it.
do i miss something?
thx

Please try to comment this line
memberGrid.enableEditEvents(true,true,true); 

unfortunately no impact :-( could it be the sub_row_grid which is attatech to each row in memberGrid?