My first model/view attempt

[Morea]

Your cents are always very valuable so it's not to late.
I'll have a look at the standard item.
Do you have any cents on how you put different objects in the tree?
It could look like this

A
|
+-B
  +-D
  |
  +-D
+-B
  +-D
  |
  +-E
+-B
|
+-C
  +-F
  |
  +-F
+-C
  +-F

A
|
+-B
  +-D
  |
  +-D
+-B
  +-D
  |
  +-E
+-B
|
+-C
  +-F
  |
  +-F
+-C
  +-F

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Should I put generic elements like this
Node
{
int type; // A,B,C,D,E,
baseclass* obj; // pointer to either A,B,C,D,E,F object
}

Or how do you do this?