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> This SHOULD be set by the Client before mapping to a list of atoms
                                    ^^^^^^^^^^^^^^
> indicating the functional type of the window. This property SHOULD be 
> used by the window manager in determining the decoration, stacking 
> position and other behavior of the window. The Client SHOULD specify 
> window types in order of preference (the first being most preferable) 
> but MUST include at least one of the basic window type atoms from the 
> list below. This is to allow for extension of the list of types whilst 
> providing default behavior for Window Managers that do not recognize the 
> extensions.

Maybe you can unmap your window, change the type and remap it (or another 
window)?

--
Mikael Magnusson