I currently have a tick box that, when selected, enables the user to input extra information (choose a name from a combo box). However if they then change there mind and deselect the tick box (thus greying out the selection) the data that has been entered in the combo box remains. Is there a delete command that I can add that will clear the contents of the box when the tick is deselected?

Hi,
you would either need to use the Undo method or OldValue property to return to the original state or set the control's value to null.
HTH
Good luck