AutoCAD Inventor :: Select Versus Pick - API

I'm writing a program (C#) that automates the notch tool within the frame generator add-in in Inventor. I can select one part and then select multiple other parts that will notch to the first selected part automatically. This will save me a TON of time if I get it working correctly. With that being said, I have it to the the point where the user selects the first part and then window multiple parts (these are stored and then cycled through later), then I use SendKeys to open the "Notch Tool", and now this is where I encounter my problem. 

The Notch Tool is waiting for the user to Pick/Select one part. In my code I've tried to use the CommandManager.DoSelect method which does not register with the tool (I'll exit out of the tool and the part will be selected). My thinking is that this notch tool will only accept the CommandManager.Pick method which would defeat the purpose of the program as I do not want the user to have to go through the parts one by one notching them together.

Is there a way to simulate a mouse click on a selected occurrence within Inventor? Is there another approach I should be considering? And finally, how to rewrite the actual notch tool to allow multiple notches to be done at once?! I'll post a snippet of my code.

docName = instance.ActiveDocument.DisplayName;
int iHandle = NativeWin32.FindWindow(null, "Autodesk Inventor 2012 - [" + docName + "]");
this.Hide();
NativeWin32.SetForegroundWindow(iHandle);
keybd_event(0x23, 0x4F, 0, 0); // Press End
keybd_event(0x23, 0xCF, 0, 0); // Release End (Brings up notch tool)
Thread.Sleep(3000);
//keybd_event(0x28, 0x0F, 0, 0); // Press Tab
//keybd_event(0x09, 0x8F, 0, 0); // Release Tab
NativeWin32.SetForegroundWindow(iHandle);
Thread.Sleep(500);
instance.CommandManager.DoSelect(vert);