fix events, fix for multiple grid configurations NOTE: there is a bug

grid column reorder: fix z-index problem, fix event cancellation

augment placement logic for grid with line-numbers

fix events, fix for multiple grid configurations NOTE: there is a bug with column selection and refresh, refresh is clearing the columns selection, this is unrelated to my changes

NOTE: There is a bug I noticed with column selection and refresh, refresh is clearing the columns
selection, this is unrelated to my changes