Hi
Giuseppe,
rDBGrid does not support showing of buttons directly in cell as usually row height is too small to show button and it looks very strange if it is used for whole column.
You have 3 possible solutions:
1/ use elipsis button in the right side of editor by column setting (ButtonStyle=cbsEllipsis), but in this case button si visible only during editing of the cell
2/ use HTML link in the cell, then whole text is shown as link and event OnLinkClick can be used to evaluate the click to link
3/ show cell in some specific color and then evaluate event OnCellClick
I hope it helps
Tomas