I have an UltraGrid and an UltraDataSource in a user control.  I have a test app in a VS2010 solution that hosts this control without issue.  When I host the control in an  existing project (that also happens to be a user control) I get an error in the designer.

My existing control was a VS2008 project, so I converted to a VS2010 project and that had no impact.  The existing control is VB.Net and the user control hold the Infragistics components is C#.  Anyone have any thoughts on what could be throwing the designer off?  

object not set to an instance of an object

at System.ComponentModel.ReflectPropertyDescriptor.SetValue(Object component, Object value)
at Microsoft.VisualStudio.Shell.Design.VsTargetFrameworkPropertyDescriptor.SetValue(Object component, Object value)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializePropertyAssignStatement(IDesignerSerializationManager manager, CodeAssignStatement statement, CodePropertyReferenceExpression propertyReferenceEx, Boolean reportError)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeAssignStatement(IDesignerSerializationManager manager, CodeAssignStatement statement)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement)