iGCol is a type from the iGrid library. It is located in the TenTec.Windows.iGridLib namespace. All samples in the manual imply that this namespace is imported at the beginning of the module:
using TenTec.Windows.iGridLib;
Otherwise we would need to write long statements like this:
TenTec.Windows.iGridLib.iGCol column = iGrid1.Cols[0];
But I agree with you that it may not be clear for a developer starting to work with iGrid. Do you think we need a preface in the manual describing this? What else should be mentioned in the preface?
TIA for your suggestions! Feedback like yours helps to improve the documentation with every realease.