A modal dialog window is a child window that must be closed before the user can continue working on the current application. Typically modal dialog windows either take control of the entire system or application displaying them until they are closed. For example, you can use a modal dialog window to retrieve login information from a user before the user can continue working on an application. Modal windows are useful in presenting important information or requiring user interaction.
You can show the C1Window control as a modal dialog box using the ShowModal method.