QTableWidget customize row colour

[THRESHE]

Hi everyone
I've encountered a problem while using sheets with Qt Designer. I try to set color for a row as a gradient like this

QTableWidget
{
	background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                stop: 0 #ffffff, stop: 1 #ecf9ff);
}

QTableWidget
{
	background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                stop: 0 #ffffff, stop: 1 #ecf9ff);
}

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But instead of painting a row with this gradient it paints all rows from top to bottom with it like it is a solid piece