First I already merged Cells like this
|------------------------------------------------|
| | |
| | LM |
| ABCDEFGHI... |---------------------|
| | NO |
Now I wanna that merged Cells text be MultiLine true
but after MultiLine set ture.
All each row height more increase. I don't want resize row.
And that text(ABCDEF...) AVlign is change to Top.
How can I setting to cell?
As to the first issue that the row height increases when CellMultiLine is true, it isn't reproduced in my side.
I attached a sample application I used to test it. Could you verify in your side, too, whether or not the issue occurs with this sample? You can test it just by running the sample and clicking radio buttons "True" and "False". If you click "True", true is set to the CellMultiLine of "Col1". And if you click "False", false is set. You'll see that the row height doesn't change between "True" and "False".
If what you mean is different from this behavior, could you tell me more exactly what your issue is?
Regarding the second issue, it is an intentional behavior.
A similar matter is discussed here: https://es.infragistics.com/community/forums/f/ultimate-ui-for-windows-forms/56418/setting-cellmultiline-true-breaks-textvalign-settings , where you can also see a link to workaround.
0284.F120240SamleApp1.zip