Excel 2013: Custom Task Pane will not display when Excel Add-In is activated!

dear Microsoft,

I wish to report this bug concerning custom task pane in Excel 2013.

We have a custom task pane in COM Add-In. Problem is, the task pane will not show if any of Excel Add-Ins are enabled.  If all the Excel Add-In are disabled, task pane will show up.

But we cannot do this as this application requires an Excel Add-In to be enabled! The application has both Excel and COM Add-Ins.  Things have always been working well in Excel 2010.

This behavior is also observed when using the simplest custom task pane from MSDN examples:

myUserControl1 = new MyUserControl();
myCustomTaskPane = this.CustomTaskPanes.Add(myUserControl1, "My Task Pane");
myCustomTaskPane.Visible = true;

My take is that when Excel Add-In is enabled, the loading of the Add-In somehow interferes with the visibility of the custom task pane; Excel does not know how to park the custom task pane. There is a bug somewhere !

Do test this out; I 'm sure you can reproduce this on your end.

Please advise what do we do now as my company is planning to roll out Office 2013 in March.

regards

Ethan Shum

February 10th, 2015 3:30am

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