how to get viewport coords of the element in the draggablepanel

[pretender]

Hi!  Great package, i am using it for a while.
I have a problem and i am not sure how to resolve it.

I have draggable panel with grid inside that holds gui elements dynamically added.
i need to draw 2d line (with another package) and i need to get viewport coords of
elements inside the draggable panel (under grid).

i am not sure what i need to be using (position,localPosition, WorldToViewport or WorldToScreen and what camera for converting coords)

here is what i have tried:

1.                
2.                 GameObject s = NGUITools.AddChild(grid,microlabel2DPrefab);
3.                
4.                 s.GetComponentInChildren<UILabel>().text = ml.GetName();
5.                 grid.GetComponent<UIGrid>().Reposition();
6.                
7.                 Vector3 mPos = GameCam.WorldToViewportPoint(ml.GetStartPos());
8.                 Vector3 gPos = GameCam.WorldToViewportPoint(s.transform.position);
9.                 VectorLine l = VectorLine.SetLine(lineColor,gPos,ml.GetStartPos());
10.  

ml is just GameObject with Transform
and s i prefab that is put in grid inside draggable label

i want to draw 2d line from element in the grid to projected 2d position of gameobject.

any help appreciated!

[EDIT]: just to add that gui element is visible only by Ngui cam and object in the scene with gamecam. the usual setup.

[pretender]

tried to work it out but i just can't get to project position of element from draggable panel to viewport and then use it to render a line from that position to another projected position in viewport coords.

[ArenMook]

Uh... so you take the label's world space position... convert it to viewport point... so far so good. Then you do something called VectorLine.SetLine which I don't know anything about. Are you sure it expects viewport coordinates? Are you sure it doesn't expect screen coordinates instead?