It is relatively easy to create an application to provide custom content for DesignCenter using the ATL AppWizard. This example is available in the ObjectARX ® SDK, but it can be created from scratch following the steps below. The sample adds text files (with .txt extensions) as content. A single-click on the text file will show the contents in the description window (if it is active). A double-click will take the content of the file and insert it as mtext into model space at the center of the current viewport using the current text style.