"Excuse me, sir, there seem to be something wrong with your markup"


Error:
System.Exception occurred
  Message=Unspecified error
  StackTrace:
       at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
       at MS.Internal.XcpImports.UIElement_Measure_WithDesiredSize(UIElement element, Size availableSize)
       at System.Windows.UIElement.Measure_WithDesiredSize(Size availableSize)
       at System.Windows.Controls.VirtualizingStackPanel.MeasureChild(UIElement child, Size layoutSlotSize)
       at System.Windows.Controls.VirtualizingStackPanel.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
       at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
       at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
       at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
       at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)

Translation:
"Excuse me, sir, there seem to be something wrong with your markup". The easiest way to track down the issue, in my oppinion, is to backtrack the layout changes you've done recently. This time, it was this part of my ControlTemplate that caused the issue:

 

Yes, you guessed it right - it's obviously the Margin property that takes four parameters and not three. Silly me.

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