set keyframes on an expression linked knob

Hello nukerz,

Sounds dead simple but can’t manage to make keyframes work on an expression linked knob.
Just made a quick example to shows what i mean.
If i move my "2d position knob", set keys on the expressionned knob "blackpoint" after moving it. It doesn’t works.
Of course i can animate my "2d position knob" but that doesn’t fit my needs.

Is anybody has an hint about this ?

Code:

set cut_paste_input [stack 0]
version 6.2 v2
Group {
 inputs 0
 name Group1
 selected true
 xpos 5199
 ypos 380
 addUserKnob {20 User}
 addUserKnob {12 focus}
 addUserKnob {41 blackpoint T Grade1.blackpoint}
}
 CheckerBoard2 {
  inputs 0
  name CheckerBoard2
  xpos 479
  ypos 315
 }
 Grade {
  channels rgba
  blackpoint {{"\[sample this red focus.x focus.y]"}}
  name Grade1
  selected true
  xpos 479
  ypos 377
 }
 Output {
  name Output1
  xpos 479
  ypos 415
 }
end_group


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