Drag and Drop TreeNodes

[abenloss]

I've created a treeview as follows:

TreeView colors = new TreeView();
TreeNode ColorList = new TreeNode();
ColorList.Text = "Color Choices";
ColorList.Expanded = false;
colors.Nodes.Add(ColorList);
TreeNode ChoiceBlack = new TreeNode();
ChoiceBlack.Text = "Black";
ColorList.ChildNodes.Add(ChoiceBlack);
TreeNode ChoiceRed= new TreeNode();
ChoiceRed.Text = "Red";
ColorList.ChildNodes.Add(ChoiceRed);
TreeNode ChoiceGreen = new TreeNode();
ChoiceGreen.Text = "Green";
ColorList.ChildNodes.Add(ChoiceGreen);
Form.Controls.Add(colors);

Question: How do I "drag and drop" the Black, Green and Red nodes?