Updates control-properties.md

Auto commit by GitBook Editor

Author: mrfearless

control-properties.md

@@ -1,10 +1,8 @@
 # Control Properties
 
-This section and the topics within it should be considered a bit more technical in nature. They cover more in depth the details on the techniques used for defining, allocating memory for, and setting/getting a control's properties.
-
 When registering our custom control \(see [Registering Our Control](//registering-our-control.md) for details\), the `cbWndExtra` field of the [WNDCLASSEX](https://msdn.microsoft.com/en-us/library/windows/desktop/ms633577%28v=vs.85%29.aspx) is used for storing additional extra bytes per instance of the control we create.
 
-In the early days of my control creation I used these extra storage bytes to store anywhere up to 128 bytes of data to hold various variables used by the control. I came across some documentation later on that suggested there was a limit of 40 bytes in some earlier versions of windows os, and that as the bytes are being allocated from the local system heap, the [RegisterClassEx](https://msdn.microsoft.com/en-us/library/windows/desktop/ms633587%28v=vs.85%29.aspx) function might fail if greater than 40 bytes is requested - [https://msdn.microsoft.com/en-us/library/ms633574\(VS.85\).aspx\#extra\_window\_memory](https://msdn.microsoft.com/en-us/library/ms633574%28VS.85%29.aspx#extra_window_memory)
+In the early days of my control creation I used these extra storage bytes to store anywhere up to 128 bytes of data to hold various variables used by the control. I came across some documentation later on that suggested there was a limit of 40 bytes in some earlier versions of windows os, and that as the bytes are being allocated from the local system heap, the [RegisterClassEx](https://msdn.microsoft.com/en-us/library/windows/desktop/ms633587%28v=vs.85%29.aspx) function might fail if greater than 40 bytes is requested: 
 
 > Extra Window Memory
 >