I changed the reference and appears 2 errors, I changed:

System.Windows.Forms.ScrollEventArgs to DevExpress.XtraEditors.XtraScrollEventArgs in
"Private Sub pnlContent_Scroll(ByVal sender As Object, ByVal e As DevExpress.XtraEditors.XtraScrollEventArgs) Handles pnlContent.Scroll"

for the errors "a 'DevExpress.XtraEditors.SplitGroupPanel' value cannot be converted to 'System.Windows.Forms.Panel'. C:\Archivos de programa\MicroFour\StrataFrame Source Code\MicroFour StrataFrame Inherited UI\DevExpress Extended\Dialogs\.... MicroFour StrataFrame Inherited UI"
I changed
Dim loPanel As Panel = Nothing to:
Dim loPanel As devexpress.XtraEditors.SplitGroupPanel = Nothing

this seems to work, but I not sure if later I have another problem with this. thanks

I was sure that something changed on dx and I have to update, but I not remembered if it was changed on version 1.6.5 or in a later version like 1.6.6 and that it are available to download with source.

Can I use the 1.6.6 inherited ui with the 1.6.5 version? (I think that can't upgrade to a beta version in my unique production pc yet)

thanks for the great support.

Technically, yes.  You could just download the 1.6.6 beta source and then strip out the inherited UI code only instead of loading the full 1.6.6 beta install.