Grigore,

It appears to be your use of the Objects[] collection that is causing the dangling internal reference.

However, if you use the Buttons collection instead it works just fine. Change your Enabled_Assign to this:

LPARAMETERS vNewVal

local i

THIS.Enabled = m.vNewVal

for i = 1 to this.ButtonCount
   this.Buttons[i].Enabled = m.vNewVal
endfor