Hi Andrés David Santacoloma Isaza,
Please refer to the following article which describes the process of hooking and unhooking event handlers: http://msdn.microsoft.com/en-us/library/aa645739(VS.71).aspx
Considering this information, you need a method named HorizVert_ToggleStateChanged if you want to use the code snippet in question: cbHorizontalFlip.ToggleStateChanged -= HorizVert_ToggleStateChanged
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