Creating new index, Add button remains disabled after selecting column

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Platform: Solaris 10 SPARC
Version: 1.10.0(Aug 7 2009, rev. 8008)
Installer: 20090807

Decription:

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When creating new index the Add button remains disabled even after selecting column.

Steps to Reproduce:

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1. Launch pgAdmin and connect to server.
2. Create a table with one column (say of integer data type)
3. Expand the table, right click Indexes and select New index.
4. Type a name for the index and then click the Columns tab.
5. Select a column from the combo box

The Add button remains disabled.

User can create an index using Query tool window.

Expected:

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Add button should be enabled after selecting a column.

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Problem not present when building wxWidgets against the latest version of GTK from Blastwave. Seems to be an issue with the version of GTK that ships with Solaris 9.