Wrap text in a grid cell ?

I have provided with setStyleGenerator the style above.

.v-grid-cell.text-wrapped {
	white-space: normal;
	overflow: hidden;		
}

When I open the application page in a browser I see the text, that is wrapped in a grid cell. But after I change (just dragging the window edge) the size of browser window, wrapping disappear.
How to achieve stable wrapping of the text in the grid cell ?