Set rows height

                <!--- SET ROWS STYLE -->
                <controls:DataGrid.RowStyle>
                    <Style TargetType="controls:DataGridRow">
                        <Style.Setters>
                            <Setter Property="Height"  Value="30"/>
                        </Style.Setters>
                    </Style>
                </controls:DataGrid.RowStyle>
                
            </controls:DataGrid>