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I have created a extension DLL that uses OG. When I click on a selected column header and try to drag it, I get an ASSERT in CGXDragLineWnd::CreateWnd(). This did not happen with OG 1.2. What am I doing wrong?
The initialization of Dlls has changed slightly. Instead of calling GXInit() and creating a CDynLinkLibrary from your DllMain routine, you should provide a Init() method for your Dll and there create a CDynLinkLibrary object and call GXInit().
Take a look at the FAQ How can I create a 32-Bit extension DLL that uses Objective Grid?