Im having this issue in Extjs grid editing. When I tab from a dropdown editor to a textarea editor, the textarea editor jumps down the screen, away from the cell I should be editing: 
I have no idea how to fix this. It only happens 1/2 of the time, so I believe there is some race condition, but Im not sure. Ive spent a lot of time debugging and stepping through the editing code and the textarea starts out in the grid cell, but some event fires or something and it then moves.
I found the problem, but I don't think there is a good solution to it. When I complete the edit by clicking tab, new value is put in the grid cell.
The grid row height might change, which will cause the grid viewport size to change (since i am not using a scroll bar.. the grid height grows and shrinks dynamically).
The grid is in an iframe, and i attached a listener to the grid resize event to change the iframe height to be the size of the grid height, this in turn caused floating elements (such as a cell editor) to be repositioned.
So my problem is that i want the iframe to grow with the grid, which grows and shrinks (by a few pixels) as cells get edited. But this causes the floating element to jump.