Shading and unshading

[TerryJ]

I'm using the shade / unshade option which you get by clicking in the 
top left corner of a window. 

Before I arrived at that, I tried double-clicking the title bar but that 
does not work.  I cannot find any way to set that.  Is it possible.

I discovered an anomaly.  The default keybinding to shade is Alt+F9.  
The same keybinding does not unshade!? =-O

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Regards, TerryJ

Using Xfce on PCLinuxOS. www.revivalcentres.org