This SDK API is necessary to load the Common control DLL into memory. This can be done indirectly by creating a Common control elsewhere in your application. The fourth pane is a dialog. Creating a dialog in a pane is slightly tricky. All the windows created in the panes of a splitter are child windows of the splitter.
Dialog windows are usually pop-up windows.
They can be created as child windows but there is no way to specify the child ID for them. The splitter window architecture dictates which panes get which IDs. The easiest way to provide dialog-like functionality in a pane is to work with the CFormView class. MFC technical Note no. All rights reserved.