Solved
How to avoid that hovering the mouse on grid rows changes the style of the row?
When a line is hovered in a Grid widget, the style that is set in the "RowFormat" property is ignored and a different style is applied.
The one that is used is set in the "Style Properties" tab of the widget and, on all of them, by default, is the Style Definition: DefaultRowHoverStyle.
This causes weird behaviours because of the different font size between both styles.
I do not know if it is possible but I think that the best solution would be to disable the style modification for hovering lines in grids. I could not find a way to do it, but maybe you know a way to do so.
In case you wonder, I am using ThingWorx 8.5.8-b414
Thanks for your help!

