AtlasMapper is broken in Internet Explorer IE9, can't add layers, can't open trees

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What steps will reproduce the problem?
1. Open the AtlasMapper in IE9
2. Try to change the base layer, or add a layer. In the Add Layer dialog trees 
don't work and layers can't be selected.

The opacity slider does not work correctly as well.

What version of the product are you using? On what operating system?
Windows 7 with IE9

Please provide any additional information below.
The GeoExt library used by the AtlasMapper does not work correctly in IE9. A 
partial attempt at a fix was done by adding a tag to tell IE9 to emulate IE8, 
with out this none of the AtlasMapper worked.

Original issue reported on code.google.com by eric.law...@gmail.com on 18 Apr 2012 at 4:47

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Original comment by eric.law...@gmail.com on 18 Apr 2012 at 4:48

• Changed title: AtlasMapper is broken in Internet Explorer IE9, can't add layers, can't open trees

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If the user enables "Compatibility mode" but clicking its icon in the address 
bar the AtlasMapper works correctly. 

Original comment by eric.law...@gmail.com on 19 Apr 2012 at 5:53

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FIXED: The X-UA-Compatible directive has to be the first line in the header.

Original comment by lafond.g...@gmail.com on 17 May 2012 at 6:39

• Changed state: Fixed

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Original comment by lafond.g...@gmail.com on 31 May 2012 at 1:05

• Added labels: IssueClosed-1.2