int dlg_action_tile (sds_hdlg handle, char *key, void *expression);
Respond when the user clicks a dialog box tile.
This function assigns the expression to evaluate when the user selects the tile referenced by key.
The key argument refers to the tile. (In this case, the tile is a user-selectable element of a dialog box, such as radio button, check box, or button.)
The handle argument is the name of the dialog box.
The expression is a pointer to a function called when the tile is selected:
The function returns RTNORM if successful; otherwise, it returns an error code.
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