Getting weird COM exceptions with drop down/combo box

[Will]

I'm getting weird COM exceptions. I can't seem to be able to click on (or execute Open command) on a drop down first time (then second time it opens and clicks on the right choice, but then it gives me COM exceptions... an example (I've also gotten System.Runtime.InteropServices.COMException (0x80004005): Error HRESULT E_FAIL as well):

Failure Information: 
~~~~~~~~~~~~~~~
ExecuteCommand failed!
InError set by the client. Client Error:
System.Runtime.InteropServices.COMException (0x80020006): Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME))
   at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
   at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args)
   at ArtOfTest.InternetExplorer.JsObjectWrapper.GetProperty(String property)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessSilverlightCommand(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)
BrowserCommand (Type:'Silverlight',Info:'NotSet',Action:'NotSet',Target:'ElementId (tagName: 'object',occurrenceIndex: '0')',Data:'{"Method":null,"Property":null,"Reference":{"ObjectName":"$root","Path":"\/page:-1:52176326","Properties":[]},"Reference2":null,"Type":4,"Value":"GkMk3aAbn2KaxwITLjrzy0pr\/Kk="}',ClientId:'Client_589f167e-dce9-452a-94fb-601859634ba0',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'System.Runtime.InteropServices.COMException (0x80020006): Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME))
   at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
   at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args)
   at ArtOfTest.InternetExplorer.JsObjectWrapper.GetProperty(String property)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessSilverlightCommand(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)')
InnerException: none.


InnerException:
ArtOfTest.WebAii.Exceptions.ExecuteCommandException: ExecuteCommand failed!
InError set by the client. Client Error:
System.Runtime.InteropServices.COMException (0x80020006): Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME))
   at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
   at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args)
   at ArtOfTest.InternetExplorer.JsObjectWrapper.GetProperty(String property)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessSilverlightCommand(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)
BrowserCommand (Type:'Silverlight',Info:'NotSet',Action:'NotSet',Target:'ElementId (tagName: 'object',occurrenceIndex: '0')',Data:'{"Method":null,"Property":null,"Reference":{"ObjectName":"$root","Path":"\/page:-1:52176326","Properties":[]},"Reference2":null,"Type":4,"Value":"GkMk3aAbn2KaxwITLjrzy0pr\/Kk="}',ClientId:'Client_589f167e-dce9-452a-94fb-601859634ba0',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'System.Runtime.InteropServices.COMException (0x80020006): Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME))
   at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
   at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args)
   at ArtOfTest.InternetExplorer.JsObjectWrapper.GetProperty(String property)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessSilverlightCommand(BrowserCommand request)
   at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommand(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)')
InnerException: none.


   at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.Silverlight.SilverlightProxy.ExecuteSLCommand(SilverlightCommand cmd)
   at ArtOfTest.WebAii.Silverlight.SilverlightProxy.GetVisualTree(IAutomationPeer root, String hash)
   at ArtOfTest.WebAii.Silverlight.VisualTree.Refresh()
   at ArtOfTest.WebAii.Silverlight.FrameworkElement.Refresh()
   at Telerik.WebAii.Controls.Xaml.RadComboBox.WaitDropDownAnimation(Int32 millis)
   at Telerik.WebAii.Controls.Xaml.RadComboBox.SelectItem(String itemText, Boolean openDropDown)
   at Telerik.WebAii.Design.Translators.Xaml.Input.ComboBox.ActionDescriptors.SelectItemNew.ComboBoxSelectAction.Execute(IApplication appHost)
   at ArtOfTest.WebAii.Design.Extensibility.XamlActionDescriptor.Execute(IAutomationHost autoHost)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)

[Anthony]

Hello Will,

Is this an HTML or Silverlight ComboBox? Is it a generic control or a RadControl?

We'd like to see the error first-hand to diagnose it. Please see here for what information to provide. If you can grant us access to your app but feel that information is sensitive, you can submit a support ticket which is confidential, unlike this forum.

If you can replicate the issue against a Telerik demo site (HTML or Silverlight), let's continue the discussion here. Please provide reproduction steps in that case.

Regards,
Anthony
the Telerik team

[Will]

Silverlight RadComboBox.

Good news, I was able to reproduce the issue with a demo project, I will be able to submit that with support ticket (corporate policy forbids us to submit any real code, only a demonstration, even for confidential support tickets).

Basically, have the SelectionChanged event wired to:

using System.Windows.Browser; // for HtmlPage.Document.Submit();

private void radComboBox1_SelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
{
    HtmlPage.Document.Submit();
}

And then program Test Studio to:

Navigate to the Silverlight page.
Open action on drop down.
Select item 1.
Wait a few msec (for the page to refresh)
Open action on drop down.
Select item 2.
Wait a few msec
Open action on drop down
Select item 3

Or something similar to that.

[Anthony]

Hello Will,

That sounds good. Please attach the demo project (within a .zip file) to a new support ticket and reference this forum thread. I'll take ownership of the new ticket once it comes in.

Greetings,
Anthony
the Telerik team