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Excel Addin sample does not show task pane
I tried a sample solution "NetOffice Excel Addin Examples", the project "NetOffice Tools - Extended". I use Excel 2013 on Windows7 64 bit. After compiled I can see the the addin "NetOfficeTools Extended Example CS4" in Excel. The
button "About" works, but the button "Sample Pane CS4 Visible" does nothing.
I wrote a simple project which creates a new Excel Application and open a workbook from the path. In this case I can see the task pane and I am able to switch it on and off.
Could you help me please?