Problem about AppDomain

[kozen]

I want to pass a WinForm control from main appDomain A to another appDomain
B.
In appDomain B, i will create some WinForm controls and add them to the
control's child controls list of main appDomain A .
But i failed, please tell me why. thanks!

code sample:

// BOView will be created in appDomain B.
// BOView receive aParCtrl from main appDomain A, then add some controls to
it.
// BOView is in assembly LoadedCmpnt.dll .
public class BOView : MarshalByRefObj ect
{
private Panel pnlCtn;

public BOView(Control aParCtrl)
{
pnlCtn = new System.Windows. Forms.Panel();

pnlCtn.Dock = System.Windows. Forms.DockStyle .Fill;
pnlCtn.Location = new System.Drawing. Point(0, 0);
pnlCtn.Name = "pnlCtn";
pnlCtn.Size = new System.Drawing. Size(292, 273);

aParCtrl.Text = aParCtrl.Text + "-- Loaded"; // ok
aParCtrl.Contro ls.Add(pnlCtn); // failed ! if remark this line,all is
right. why ?
}
}

code in main appDomain :

{
Panel pnlParent = new System.Windows. Forms.Panel();

B = AppDomain.Creat eDomain("AppDom ain B");
ObjectHandle oh = B.CreateInstanc eFrom(
"LoadedCmpnt.dl l",
"LoadedCmpnt.BO View",
false,
System.Reflecti on.BindingFlags .CreateInstance ,
null,
new object[] {pnlParent},
null, null, null );
}