Hmm, don;t know exactly, but take a look to the MemoWindow property of TextBox. I usually use EditBox control in the grid column that displays correct content of memo field instead of 'Memo'.The memoWindow property is (None) -- the default. I like the textbox because I like the compactness of the column and editing in a separate window.
Kevin
P.S. I added a editbox to the grid to try it out and since it is clumsy to do it visually, I added two editboxes -- how in the world do you get rid of one of the extra controls?