Most of the current development at Geosoft is done in the C# .NET environment and there are lots of examples showing how this is done. In particular the <Geosoft>\GX developer\gxnet\src\gxnet.csproj file includes the code for all of the Geosoft .Net GXs.

In order to access your routine from within montaj you will need to create a menu item with the second parameter in the form:

dllname(assemblyname.gxname;method)

for example the dap.smn menu contains the following item:

ITEM "Add Bing Maps Imagery..." ,Geosoft.EIMS.GXNet.dll(Geosoft.EIMS.GX.AddBingLayerToMap;Run) {?map}

That is, the Run method of the AddBingLayerToMap gx, which is part of the Geosoft.EIMS.GX namespace and is found in the Geosoft.EIMS.GXNet assembly.