Default a unique value to property on a component

[fatboy]

I have a lot of existing forms that descend from a custom base class.

I want to add to the base class a new property containing a unique string.
When the application is next built i want to default these properties and
then store them for future builds.

This is basically the same as the 'Text' property on a form. When it is
first created it defaults to something like 'Form1' or 'Form2' etc and this
value is stored in the form InitializeComponent method for next time but can
be overriden if required.

If i create a property then edit it at design time it is saved in the
InitializeComponent method. I want to do this automatically.

How do i force a call to rewrite the InitializeComponent method or mark my
property on the component to do this for me.

In the below example if you create a form descendant from the class the
IDString is regenerated everytime until you manually change it at design
time.

public class IDForm : System.Windows.Forms.Form
{
private string m_IDString;
public string IDString
{
get
{
if(m_IDString == null)
IDString = Guid.NewGuid().ToString();
return m_IDString;
}
set
{
m_IDString = value;
}
}
}

thanks in advance