If you want to override a general On Key Down function, try to use On Preview Key Down. This function works for all the children widgets, and On Key down function at the base widget works if the same key is not called at the on preview key down.
If you want to override a general On Key Down function, try to use On Preview Key Down. This function works for all the children widgets, and On Key down function at the base widget works if the same key is not called at the on preview key down.