On Workbook Open, all CustomTaskPanes added in the VM are Visible.

[roxberry]

I commented out this:

            //if (IsMdi())
                //UpdateCustomTaskPanesVsibilityForContext(this, new HideCustomTaskPanesForContextEventArgs<ExcelRibbonType>(wb, true));

in VSTOContrib.Excel.RibbonFactory ExcelViewProvider.cs (line 97) and it fixes the issue, but I don't know really what the event is supposed to do.

Can I get a clarification?

If it is not affective for Excel, can we remove (it fixes the Visibility problem as far as I have tested). I can commit and do a pull request in short order.

[JakeGinnivan]

It was an attempt to fix issues with excel around the changes between office 2010 and 2013 (MDI to SDI)

We need to find a solution which works for 2010 and 2013

[roxberry]

Ah, o.k. - I'm in 2010, I'll work with both and see if I can find a happy path. Maybe just a condition when it's a NewWorkbook vs. a WorkbookOpen - I'll test on both versions.

[roxberry]

I'll need to spend more time on it - it looks like the call sets all taskpanes visible on Activate and hides all taskpanes on Deactivate.

Activate -
if (isMDI())
UpdateCustomTaskPanesVsibilityForContext(this, new HideCustomTaskPanesForContextEventArgs(wb, true));

I tried on both 2010 and 2013 with the call commented out and had no side effects. What issue did you see (how did you see it)?

Can you submit the other fix to NuGet? That fixes opening a workbook and not having the taskpane, which is a higher priority, imho. I can live with visibility for now.

[JakeGinnivan]

Pretty sure this is fixed in v1, I am just updating my 2007 and 2010 VM's to verify. If all the testing goes well, i will release v1 this week