Dualslider problem

I've got a problem.

I am using the dualslider control inside a usercontrol. This usercontrol is inserted into my mainwindow.

The RangeStart and RangeEnd of the dualslider are bound to two double properties defined in the usercontrol.

When I open the usercontrol itself in the visual studio designer, all is fine.

As soon as I open my mainwindow inside the visual studio designer I get the following error. Can you please help me ?

Exception has been thrown by the target of an invocation.
   at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)

 
Object reference not set to an instance of an object.
   at System.ComponentModel.ReflectPropertyDescriptor.SetValue(Object component, Object value)
   at Microsoft.Windows.Design.Metadata.MetadataStore.MetadataStoreProvider.MetadataStorePropertyDescriptor.SetValue(Object component, Object value)
   at MS.Internal.Data.PropertyPathWorker.SetValue(Object item, Object value)
   at MS.Internal.Data.ClrBindingWorker.UpdateValue(Object value)
   at System.Windows.Data.BindingExpression.UpdateSource(Object value)
   at System.Windows.Data.BindingExpressionBase.UpdateValue()
   at System.Windows.Data.BindingExpression.Update(Boolean synchronous)
   at System.Windows.Data.BindingExpressionBase.Dirty()
   at System.Windows.Data.BindingExpression.SetValue(DependencyObject d, DependencyProperty dp, Object value)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at Mindscape.WpfElements.DualSlider.set_RangeEnd(Double value)
   at Mindscape.WpfElements.DualSlider.#4K(Double end)
   at Mindscape.WpfElements.DualSlider.#KK()

Hello Sanders, sorry for the late reply

I've tried what you have described but have not been able to reproduce this issue. Are you able to send us a simplified example? You can attach a sample to a reply forum post, or send it to jason@mindscape.co.nz. Remember to remove the binaries before sending.

Cheers
 - Jason