good first issuetype: bug
Description
Here's the plnkr: http://plnkr.co/edit/MAjaBO3Bpe3mf04JxWpo?p=preview Simply open one of the column menus and see it doesn't show in the right place.
Using this code in the repositionMenu function:
if (column.grid.isRTL()){
left = positionData.left + positionData.parentLeft+ positionData.width;
}
Seems to fix this.