CatalogContentType GetCurrentContentType()

//Gets the Catalog pane
var catalogWindow = Project.GetCatalogPane() as ICatalogWindow;
var catContentType = catalogWindow.GetCurrentContentType();

//Gets the Catalog pane
var catalogWindow = Project.GetCatalogPane() as ICatalogWindow;
if (!catalogWindow.IsActiveWindow)
    return; //catalog dockpane must be the active window

//Change the content to whatever is the next tab
var catContentType = (int)catalogWindow.GetCurrentContentType();
catContentType++;

if (catContentType > (int)CatalogContentType.Favorites)
    catContentType = (int)CatalogContentType.Project;

//Must be on the UI - no QueuedTask!
catalogWindow.SetContentTypeAsync((CatalogContentType)catContentType);

//Gets the Catalog pane
var catalogWindow = Project.GetCatalogPane() as ICatalogWindow;
if (!catalogWindow.IsActiveWindow)
    return; //catalog dockpane must be the active window

var catContentType = catalogWindow.GetCurrentContentType();
//Is portal content being shown?
if (catContentType == CatalogContentType.Portal)
{
    //check what is the portal content type being shown...
    var portalContentType = (int)catalogWindow.GetCurrentSecondaryPortalContentType();
    //advance to the next tab
    portalContentType++;
    if (portalContentType > (int)CatalogSecondaryPortalContentType.LivingAtlas)
        portalContentType = (int)CatalogSecondaryPortalContentType.UserContent;

    //set the secondary portal content type
    //Must be on the UI - no QueuedTask!
    catalogWindow.SetSecondaryPortalContentTypeAsync(
        (CatalogSecondaryPortalContentType)portalContentType);
}