VI_Edit_FK not showing searchbox

Hi all

I am facing a very annoying problem when I use the web component VI_Edit_FK. IT works pretty well except when I try to edit the UID_FirmPartner,

Once a user click on the button "Assign", the component open the popup but it does not show the searchbox to filter the results. I am getting crazy to find a solution and to force that searchbox to be displayed.

Can someone please help me?

Thanks you in advance

Alberto