Weird virtual methods of the ListBox don't seem to do anything at all.

[aewarnick]

My MB (custom messageBox) never shows!

protected override void AddItemsCore(object[] o)
{
a.MB.ShowDialog(o.GetType());
if(o.GetType() == typeof(FileLBItem))
        this.Items.Add(o);
return;
}

protected override void SetItemsCore(IList o)
{
a.MB.ShowDialog(o.GetType());
if(o.GetType() == typeof(FileLBItem))
	this.Items.Add(o);
return;
}

protected override void SetItemCore(int i, object o)
{
a.MB.ShowDialog(o.GetType());
if(o.GetType() == typeof(FileLBItem))
	this.Items.Add(o);
return;
}

I am trying to check if the Item that is added to the listbox is of a certain type before I add it.

 

But none of these methods do anything at all. I know I didn't call the base methods in the code above but I do have it in my code here at home.

 

Is there any way to check the items BEFORE they are added to the ListBox?

Edited October 11, 2003 by aewarnick