VS not opening .ui files with Qt Designer

[gib]

I am using Qt 4.8.1 (64-bit, built from source) with Visual Studio 10 and cmake 2.8. The Qt VS add-in is 1.1.11. When I double-click on a .ui file in VS it invokes the xml editor, not Qt Designer, and Open With does not show Qt Designer in the list. This is a project that was generated by cmake from CMakeLists.txt. If I use Qt Creator everything works normally. How can I tell VS to use Qt Designer?

[gib]

I tried reinstalling the add-in, but it didn't make any difference.

[gib]

I found the answer. The CMakeLists.txt file (which I did not write) was creating a SOURCE_GROUP called "Resources" for the UI forms. I changed the name to "Forms" and now VS knows to use Designer to open the .ui files:

###SOURCE_GROUP("Resources" FILES
SOURCE_GROUP("Forms" FILES
${ImageViewer_UI}
)