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What event notifies me that the user wants to navigate to another cell?
The CanSelectCurrentCell() method is called from Objective Grid before grid deactivates the previous current cell and again before the grid activates the new current cell. CanSelectCurrentCell() is called with the coordinates of the old and the new current cell. If you return FALSE the grid will abort moving the current cell.
Another more powerful method that you can override is SetCurrentCell(). SetCurrentCell() is the method in Objective Grid that is responsible for positioning the current cell. SetCurrentCell() is called before CanSelectCurrentCell(). Actually, SetCurrentCell() will call CanSelectCurrentCell() and check the return value.