when the code run to " ultraToolbarsManager1.Ribbon.ApplicationMenu2010.DropDown(); "
get the NullReferenceException ,the details are:
System.NullReferenceException was unhandled by user code Message=Object reference not set to an instance of an object. Source=Infragistics2.Win.UltraWinToolbars.v10.3 StackTrace: at Infragistics.Win.UltraWinToolbars.BackStageMenuAgent.GetElementRectRelativeToContainer(UIElement element, Control container) at Infragistics.Win.UltraWinToolbars.BackStageMenuAgent.CalculateRequiredDropDownSize(Size& minSize, Size& preferredMinSize, Size& preferredSize, Size& maxSize) at Infragistics.Win.UltraWinToolbars.BackStageMenuAgent.GetPopupControl() at Infragistics.Win.UltraWinToolbars.BackStageMenuAgent.DropDown(Rectangle fileMenuButtonRect, Boolean resetActiveContentTool) at Infragistics.Win.UltraWinToolbars.BackStageMenuAgent.DropDown(Rectangle fileMenuButtonRect) at Infragistics.Win.UltraWinToolbars.ApplicationMenuAgentBase.DropDown() at Infragistics.Win.UltraWinToolbars.ApplicationMenuBase.DropDown() at WindowsFormsApplication1.Form1.Form1_Load(Object sender, EventArgs e) in D:\My Documents\My Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs:line 22 at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Windows.Forms.Form.OnLoad(EventArgs e) at System.Windows.Forms.Form.OnCreateControl() at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.WmShowWindow(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.Form.WmShowWindow(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) InnerException:
Hello zxfwinder,
I was not able to reproduce your scenario so I attached my sample in this post. Everything is working fine with the code I am using. Please review my application and feel free to let me know if there is something bothering you.
I still encounter this problem and I can repro it in your sample application if I move the call:
ultraToolbarsManager1.Ribbon.ApplicationMenu2010.DropDown();
into the constructor or into a handler for the Form's "Load" event.
Is there an easy way to have the 2010 style application menu automatically drop down when the form is opened?