creating tbitmap 8 bits in lazarus linux

[dcelso]

How can i create a 8bit tbitmap with a custom palette?

I tried this.
Bmp : =  tbitmap.create
Bmp.pixelformat:=pf8bit

But when i read after those property it is in pf24bit.

I tried create a palette. But i cannot localized createpalette function that was in Delphi.

Any one know why can not i use pf8bit ?
Any one know another method to create palettes?