>I know how to remove a grid column from a run-time environment with Grid.DeleteColumn[(nIndex)] method, but it's rather silly that I don't know how to do it in development environment when I "paint" the grid to the form.
>Actually, the only way I know is to set the Grid.ColumnCount property, but that's not exactly what I want.

Apart from what Naða (Nadya, how do you like your name spelled like this?) told you, you can also use the programmatic approach. Select the grid, then in command window

aselobj(aArr)
oGrid=aArr[1]
oGrid.DeleteColumn(nOneYouWant)

(®iv bio i velik ti poras'o)