How can I change the 259 char limit inside WinForms Treeview LabelEdit?

Dim mynode As New TreeNode
Dim SomeBigCustomObject as New MyContentStorageObject(name,content)
mynode.Text = SomeBigCustomObject.Name
mynode.Tag = SomeBigCustomObject
TreeView1.Nodes.Add(mynode)

dim ContentStorageObject As MyContentStorageObject = CType(e.Node.Tag,   MyContentStorageObject)
dim content as string = ContentStorageObject.Content