Schneider Electric GIS Tech Support

I have a source that did in Arc FM 8.3.1 that works as follows:

[code]
Dim pMMDesignerTools As IMMDesignerTools
Dim pMMDesignerViewOnly As IMMDesignerViewOnly

pMMDesignerViewOnly = ArcMapApp.FindExtensionByName("Designer XML API Extension")
pMMDesignerTools = ArcMapApp.FindExtensionByName("Designer XML API Extension")

If ( pMMDesignerTools.Editor.EditState = esriEditState.esriStateEditing And pMMDesignerTools.DesignTree.ViewVisible = True ) Then
...

End if
[/code]

Migrating to 9.2.1 would be like? Equal? I am using Vb.Net 2005 Framework 2.0 Service Pack ArcGis + 4.0 + ArcFM 9.2.1.

Anyone can help me, because of references to migrate to the former Code have described the following error:

---------------------------
WMSCommands
---------------------------
MMDesignerAPI.MMDesignerImpl.IMMDesignerTools_Editor:

Type mismatch

Error at line: 467 - Build: 9.21.4573
---------------------------
OK
---------------------------