custom filter in Header

Is it possible to add an custom filter into the allready exsisting attachedheader?

for example an special select box (for smart rendering with dynamix loading) or an checkbox.

You can get reference to the necessary grid’s header using:
var hdr=mygrid.hdr.rows[HEADER_ROW_INDEX].cells[COLUMN_INDEX];
hdr.innerHTML=“select”
mygrid.makeFilter(“customFilter”,COLUMN_INDEX)