Ok, thank u

If all you want is for the proxy control to be mulitline, then you might want to keep using the default cell proxy and just get the latest service release. We just recently fixed a bug where the proxy controls were not honoring the CellMultiline property of the grid column.

how i make other control be detect timely?

The aim  i use own control is make text multiline.

  Fora case, WinGrid cell can timely detect  the change of cellproxy, but can't timely detect the change of other control.

Okay, I see. It wasn't clear to me that you were using your own control instead of the proxy controls.For a case like this, you would have to handle the events on the control itself.

So you could use the Validating event as the equivalent of BeforeCellUpdate and the Leave event would be the closest equivalent to AfterCellUpdate.