I have a couple of columns in a bound grid that are not set to any field (one is a used for expansion/collapse and the other is filler column). It seems that they are returning the ToString() property of the underlying bound object. I've overrided the PaintTextInCell property which works fine, but the Tooltip caption still appears. The ToolTipShow event does not seem to fire for these either.
What can I do to change the underlying text value?