1. Locate the Form which is a container for multiple-document interface (MDI) child forms. Change its base class from Form to LinsUI.FlexMDIF orm. For example, if MyMDIForm class is your MDI container,
// The old code
public partial class MyMDIForm : Form
{
}

// The new code
using LinsUI;
public partial class MyMDIForm : LinsUI.FlexMDIF orm
{
}

2. Open Program.cs...