What has your experience been with displaying user controls using the 2011 api?
SolidworksApi macrosDisplay .NET controls in the SolidWorks user interface. See IPropertyManagerPageWindowFromHandle, IModelViewManager::CreateFeatureMgrWindowFromHandle, IModelViewManager::CreateFeatureMgrWindowFromHandlex64, IModelViewManager::DisplayWindowFromHandle, IModelViewManager::DisplayWindowFromHandlex64, ITaskpaneView::DisplayWindowFromHandle, and ITaskpaneView::DisplayWindowFromHandlex64