I need some method for make if some user select container only, and
move z order, all nodes inside container, move following the container z order.

Right now that not happen.
The only way to move all objcts follwing the z order level of container is
select all. (container + inside container nodes)

Exist some method for make nodes inside follow the z order of container?

Select all nodes +container is ok, but cause confusion to users.

At same time, if i move node inside container, when move that node to -
zorder (downlevel), in some moment, the node go out of container and is
moved to more lower z order level of container.
That make node go out of container.

Should be suposed the nodes inside a container cant or never should  reach
more lower order of the container for prevent that happen.
Is possible fix all this with some code?

Best regards.

Thankyou this work ok , anyway i continue with a ugly problem.
If form some reason user select single object or multiple inside of container, and move by accident node to down zorder (-z order)
The object/s is hidden an disaper.
You have to chose container and move z order for fix.

How can prevent object inside of node be moded under z order of container?

The same situation happen if user select contaner and all objects inside.

Objects inside container, never should go to more lower z order of container z order level and i think that should be a feature.

How can prevent this happen?



void SetZdown(DiagramItem item)
{
item.ZBottom();
var ctr = item as ContainerNode;
if (ctr != null && ctr.SubordinateGroup != null)
{
foreach (DiagramNode child in ctr.SubordinateGroup.AttachedNodes)
child.ZLevelUp();
}
}

void SetZup(DiagramItem item)
{
item.ZTop();
var ctr = item as ContainerNode;
if (ctr != null && ctr.SubordinateGroup != null)
{
foreach (DiagramNode child in ctr.SubordinateGroup.AttachedNodes)
child.ZTop();
}
}



for move down to bottom leevel
foreach (DiagramItem item in form.Selection.Items)
SetZdown(item);

for move up to top level
foreach (DiagramItem item in form.Selection.Items)
SetZup(item);


This is working now how i like, but nodes inside container can be moved to lower level and i need prevent that.