Hi Johann,

I tested the following lines of code using Xamarin Studio 5.5.4-5.7 and did not encounter any exceptions.

nfloat width = 150;
IGColumnWidth columnWidth = IGColumnWidth.CreateNumericColumnWidth(width);

Would you be able to attach a sample to your next reply that causes an exception with the code you mentioned? Additionally, you may want to place your IGColumnWidth instance into a instance variable so there is no chance it would get released before assigning the Width property of IGGridViewColumnDefinition.

i can provide you a sample on our server. Here is the link: https://www.hidrive.strato.com/lnk/wEmIGLCS

Test.zip contains an adjusted Xamarin Popovers Sample with IG.Unified.dll which leads to an Exception using it:

Tap on “Tap” and the mentioned exception is thrown:

2015-01-09 10:44:48.707 Popovers[1728:35392] System.Exception: Failed to marshal the Objective-C object 0x18dd8550 (type: IGColumnWidth). Could not find an existing managed instance for this object, nor was it possible to create a new managed instance (because the type 'Infragistics.IGColumnWidth' does not have a constructor that takes one IntPtr argument).

  at ObjCRuntime.Runtime.MissingCtor (IntPtr ptr, IntPtr klass, System.Type type, MissingCtorResolution resolution) [0x00046] in /Developer/MonoTouch/Source/maccore/src/ObjCRuntime/Runtime.iOS.cs:392

  at ObjCRuntime.Runtime.ConstructNSObject[IGColumnWidth] (IntPtr ptr, System.Type type, MissingCtorResolution missingCtorResolution) [0x0002a] in /Developer/MonoTouch/Source/maccore/src/ObjCRuntime/Runtime.iOS.cs:415

  at ObjCRuntime.Runtime.GetNSObject[IGColumnWidth] (IntPtr ptr) [0x000c1] in /Developer/MonoTouch/Source/maccore/src/ObjCRuntime/Runtime.iOS.cs:521

  at Infragistics.IGColumnWidth.CreateNumericColumnWidth (nfloat width) [0x00000] in <filename unknown>:0

  at Popovers.DetailViewController.ShowPopover (Foundation.NSObject sender) [0x00015] in /Users/gdo/Samples/TEST/DetailViewController.cs:125

In DetailsViewController.cs:

        public void ShowPopover (NSObject sender) {
            // Set the sender to a UIButton.
            UIButton tappedButton = (UIButton)sender;

        
            // for TEST
            // Present the popover from the button that was tapped in the detail view.
            //DetailViewPopover.PresentFromRect (tappedButton.Frame, View, UIPopoverArrowDirection.Any, true);

            try {

                nfloat width = 150; 
                IGColumnWidth columnWidth = IGColumnWidth.CreateNumericColumnWidth (width);
                Console.WriteLine (columnWidth.ToString ());

            } catch (Exception e) {

                Console.WriteLine (e);
            }


            // Set the last button tapped to the current button that was tapped.
            LastTappedButton = sender;
        }

Thanks,

Johann