I am developing a custom EXCEL (2007) AddIn using VSTO (VS 2010) on .Net 4.0

One of the cells has a custom editor ; the control consists of WPF Control, WPF User Control and ElementHost Control as ccontainer/host control.

The custom editor seems to be working fine but stops working when worksheet is zoomed to less than 100%.

EXCEL throws following message :

Windows Forms Controls have been disabled because the document has been scaled.When zoom returns to 100, controls will reactivate.


I found a link that tells this to be a limitation but gives no details or explaination.

Can anyone explain the details about this behavior and suggest the alternate solution on developing custom cell editors based on WPF controls and ElementHost Controls ?

Thank you.