Creating custom arrays control

[Robbo99]

G'day Guys,

I'm currently working on a form in VB.Net 2010 which has a number of controls which are added dynamically at runtime to a panel which sits in a tabcontrol.
The control i'm trying to add is a groupbox with a number of textboxes and labels.
I have been using the following example: http://msdn.microsoft.com/en-us/libr...=vs.71%29.aspx
Where I'm stuck is that I have an Null value error when the form is loading which comes from my control array class.
This error is generated by

me.list.add(machine_control)

where machine_control is an instance of my custom controls class.
Does anyone have any pointers as to how I can initializes this with values to avoid the NULL value error.

-Cheers Robbo

[HanneSThEGreaT]

Which Form event did you put that line of code?

[Robbo99]

Hi HanneSThEGreaT,

The Line of code is in the array control class. the Add_a_machine_grpbox_to_the_list is called called whenever I want to add another custom control

 Public Function Add_a_machine_grpbox_to_the_list()
        'Creates a new instance of the custom machine info control class
        Dim Machine_Control As Custom_View.Machine_details_box

        'Add the custom control to the collections internal list
        Me.List.Add(Machine_Control)

        'Adds the button to the controls collection of the panelview
        HostForm.Controls.Add(Machine_Control)

Thanks

Robbo