I was working my way through this ESRI Walkthrough: Building custom UI elements using add-ins (ArcObjects .NET 10 SDK).  And came across a couple minor errors that I had to correct during the process.

First, while implementing the OnClick() code for ZoomToLayer.vb, Visual Studio gave me a ‘Name ‘ArcMap’ is not declared.' error.

In the walk-through, they mention that the ArcMap method of your class.  For me, however, it appeared under the .My method.  Not sure if this is something specific to my set-up or, as I’m guessing, something that got changed after the first documentation was created and the final libraries published.

The fix is just adding  ‘My.’ to the namespace in this line:

ZoomToActiveLayerInTOC(TryCast(ArcMap.Application.Document, IMxDocument))

To get this:

ZoomToActiveLayerInTOC(TryCast(My.ArcMap.Application.Document, IMxDocument))

When I added the code for AddGraphics.vb, I got 8 errors.  There was essentially two errors, repeated four times.  I took a screen shot after fixing the first error pair:

The fixes in this case was also to use the complete name space path.  Examples:

Change this:

(geometry.GeometryType) = esriGeometryType.esriGeometryPoint Then

To this:

If (geometry.GeometryType) = ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint Then)

And change this:

simpleMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle

To this:

simpleMarkerSymbol.Style = ESRI.ArcGIS.Display.esriSimpleMarkerStyle.esriSMSCircle

Overall, the walk-through is very well done, just a couple minor tweaks.  I am now working my way through modifying an existing solution–one that included seven projects–to see if I can create an ArcGIS 10 Add-In.