[bug #2553] (thuban) Layer-Class visibility (dialog) is set incorrect by code

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2553
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Subject: Layer-Class visibility (dialog) is set incorrect by code

Operating System: GNU/Linux
Thuban version: CVS, 20040722
wxPython version: other, 2.4.2.4
Python version: other, 2.3.4
PySQLite version: 0.4.3
SQLite version: other, 2.8.13
GDAL version: other, 1.2.0.0
proj version: 4.4.7

if i set the visibility of a group by the code 

new_group = ClassGroupSingleton(label = "Classname")
new_group.SetVisible(False)

to invisible and then add the layer with that class to thuban, the layer is not shown. So far all works fine, but if i open the properties dialog, the singleton group is marked as visible, and its very difficult to mark it now to visible.


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