Thank you.
It works.

I found also that up and down arrow keys does not move to previous and next row if combobox in grid is active.

How to force up/down arrows to move between rows ?

>Set the DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing;
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>~~Bonnie
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>>I use DataGridView containing DataGridViewComboBoxColumn column.
>>Combobox column displays dropdown list opening selection triangle in all rows. This covers part of visible data if columns are narrow.
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>>How to force dropdown list opening control to appear only in active (current) row ?