Starting with version 19.2, you can show flyout hints that support any control as their content. Refer to the ToolTip Types help topic for more information in this regard.
If your task is to manually show a form with any content, consider the use of FlyoutPanel that we support starting with version 13.2.
For earlier versions:
This example demonstrates how to use any control as a tooltip for DevExpress controls. You can find more information in the GetActiveObjectInfo article.