How do I move, reparent and show/hide widgets properly?

[col000r]

I have a scrollview with thousands of items. To make this work at a reasonable framerate, I only add 50 or so cells and repurpose, refill and move them around the scrollview as items move in and out of view. All in all I only need about twice as many cells as can be in view at once to scroll through thousands of items with great framerate.

But as I keep scrolling and showing and hiding and moving, things go weird. I'm fading visibilities in and out all over the place (due to mouseover, different parts of a cell have different opacities depending on their type, fade out/fade in when I switch categories, etc.) All cells that are not currently needed are moved to a secondary off-screen widget on a different panel and are hidden.

My problem: widgets tend to get stuck at wrong opacity. The inspector displays the correct opacity, but it's displaying something else. If I disable and enable the gameObject in the inspector, everything snaps back to the way it should look.

What can I do in code to make sure a widget that might have been hidden, moved to a different parent and had its opacity changed will refresh and display its current condition properly?

So far I'm calling ParentHasChanged on the widget and panel.Refresh on the panel.

[ArenMook]

In which version of NGUI? I vaguely recall this happening in a version from maybe 3 months ago or so...

[Bastek]

I have similar problem. I use Unity 4.5.3 and NGUI 3.7.1.
Sometimes when i change parent of the object to different panel and use ParentHasChanged on widget (and all of it's children) not every object is visible after reparenting. And like col000r said - when i disable and enable this object in editor it is visible again.

[col000r]

I'm still on 3.6.9, let's see if upgrading to 3.7.1 fixes it!

[PoN]

i think i have similar trouble , in unity 4.5.5 and ngui 3.7.4. . when i use drag & drop item which has uipanel component, and when item goes back to grid if can't dropped to right a surface. i use hack like this :

1.         panelItem.enabled = false;// NGUI hack
2.         panelItem.enabled = true; // NGUI hack
3.  

or without this hack, item is just disappear when moved back to grid.