UIControlled   |  
 Create a new RibbonPanel on the Add-Ins tab. 
 Namespace: Autodesk.Revit.UI
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 25.0.0.0 (25.0.0.0)
| Exception | Condition | 
|---|---|
| ArgumentNullException | panelName is . | 
| ArgumentException | panelName is Empty. | 
| InvalidOperationException | If more than 100 panels were created. | 
 This method will create a custom panel appending to the Revit AddIns tab. This method is not supported in Macros. 
 public Result OnStartup(UIControlledApplication application)
{
    // add new ribbon panel
    RibbonPanel ribbonPanel = application.CreateRibbonPanel("NewRibbonPanel");
    //Create a push button in the ribbon panel “NewRibbonPanel”
    //the add-in application “HelloWorld” will be triggered when button is pushed
    PushButton pushButton = ribbonPanel.AddItem(new PushButtonData("HelloWorld", 
        "HelloWorld", @"D:\HelloWorld.dll", "HelloWorld.CsHelloWorld")) as PushButton;
    // Set the large image shown on button
    Uri uriImage = new Uri(@"D:\Sample\HelloWorld\bin\Debug\39-Globe_32x32.png");
    BitmapImage largeImage = new BitmapImage(uriImage);
    pushButton.LargeImage = largeImage;
    return Result.Succeeded;
}