selection filter on drum notes

hey folks

having trouble doing the following:

i want to select all drum notes of a certain pitch, and replace them by selecting another pitch from the drumselector input mode.

so here is what i am trying:

1> click on the note i want to change.
2> select/more
3> choose same notehead, same voice, same pitch, same staff

Now i can see that all my drumnotes i want to replace are highlighted. so far so good.
4> now, when i open the drumselector and click on the note i want, all my highlighted drums vanish and i end up only being able to change the single note i have under my cursor.

Can anyone point me in the right direction? I have tried various toggels onnote input mode and such, but no luck

thanks