>It is possible to select multiple TextBoxes and modify the font size or whatever for all of the selected TextBoxes.
>
>Is it possible to do it for elements contained in a grid ?
>
>I mean can I select multiple column headers and modify all the properties for the selected headers like it can be done for TextBoxes ?

No, you can't do this at design time, but you could look at using the SETALL method at runtime.