The grid header is limited to one line only. You can fake a second line by placing a label on top of the grid.

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>My Content is numeric. But I want to use more than one word to descript it. The Header become too Long. It seem not comfortable.
>Is the Header can contain over one Line.
>I have tried this : [thisform.mygrid.header.caption='header1'+chr(13)+'header2'] but fail it is still the long one.