Open a part invisibly while drawing is already open

I tested out using the refModelDoc2 object from my code to iterate through the feature tree and it worked with this code snippet I found online. I'm not sure why yours isn't working. I'm not using the FeatureManager like you are here but I made sure that I could set it to something and it was not null. It contained all of the variables I would expect it to have.

Code:

for(int x=0; x< refModelDoc2.GetFeatureCount(); x++)
{
     Feature swFeat = (Feature)refModelDoc2.FeatureByPositionReverse(x);
     if(swFeat != null)
     {
          Trace.WriteLine("Feature: " + swFeat.Name + " [" + swFeat.GetTypeName() + "]");
     }
}

Output:

Feature: M1.2x0.25 Tapped Hole1 [HoleWzd]
Feature: Point1 [RefPoint]
Feature: Coordinate System1 [CoordSys]
Feature: Axis1 [RefAxis]
Feature: Cut-Extrude1 [Cut]
Feature: Sketch2 [ProfileFeature]
Feature: Boss-Extrude1 [Extrusion]
Feature: Sketch1 [ProfileFeature]
Feature: Tables [ConfigTableFolder]
Feature: MateReferences___EndTag___ [FtrFolder]
Feature: Default-<1> [PosGroupFolder]
Feature: MateReferences [MateReferenceGroupFolder]
Feature: Origin [OriginProfileFeature]
Feature: Right Plane [RefPlane]
Feature: Top Plane [RefPlane]
Feature: Front Plane [RefPlane]
Feature: 1060-O   [MaterialFolder]
Feature: Equations [EqnFolder]
Feature: Lights, Cameras and Scene [EnvFolder]
Feature: Solid Bodies [SolidBodyFolder]
Feature: Surface Bodies [SurfaceBodyFolder]
Feature: Annotations [DetailCabinet]
Feature: Design Binder [DocsFolder]
Feature: Sensors [SensorFolder]
Feature: Selection Sets [SelectionSetFolder]
Feature: History [HistoryFolder]
Feature: Favorites [FavoriteFolder]
Feature: Comments [CommentsFolder]

Nadav,

Every document always has its own feature manager and its own extension.  You have to get the feature manager or extension from the ModelDoc2 you're interested in.  You have to do something like:

dim myDwg as sldworks.drawingdoc

dim myDoc as sldworks.modeldoc2

dim myView as sldworks.View

dim myMgr as sldworks.featuremanager

dim myExt as sldworks.modeldocextension

....

set myDwg = swapp.activedoc

set myView = myDwg.activeview

set myDoc = myView.ReferencedDocument

set myMgr = myDoc.FeatureManager

set myExt = myDoc.Extension