wax: ComboBox in Panels doesn't show up

[Norbert]

Found the error : I copied and pasted and got the first parameter in
the class creations wrong :
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gp.AddComponent(0,0,Label(gp, "Umgebung :"))
gp.AddComponent(1,1,ComboBox(gp, UMGEBUNGEN, readonly=1))
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note the parameter 'gp'.