MDI Parent Problem

I have a form called ChildForm and it includes a globeControl. When i try to add a layer when ChildForm is created(in its constructor) and give it to a form called ParentForm layer is not seen. ParentForm is an mdiContainer and ParentForm is the MDIParent of the ChildForm.However, when ChildForm includes a mapControl and when i try the same case layer is seen. As far as i understand 3D ESRI component does not support mdiParent. Am i wrong? Is there a way to make a 3D ESRI component as MDIParent?

Any help will be appreciated.

Here is my code:
In the parent form when the button is pressed , childform is created.

//Form4 is the childForm
public partial class Form4 : Form
{

public Form4()
{
InitializeComponent();

addFeatureLayer();

}

private void addFeatureLayer()
{
//create a feature layer
IFeatureLayer featureLayer = new FeatureLayer();
IWorkspaceFactory wf = new ShapefileWorkspaceFactory();
IFeatureWorkspace workspace = (IFeatureWorkspace)wf.OpenFromFile("D:\\ROGIS_YENI\\trunk\\codes\\ornek veriler\\GSHHS", 0);
IFeatureClass featureClass = workspace.OpenFeatureClass("GSHHS_l_L1.shp");
featureLayer.FeatureClass = featureClass;

((ILayer)featureLayer).Name = "Globe";

axGlobeControl1.GlobeDisplay.Scene.AddLayer((ILayer)featureLayer, true);

axGlobeControl1.GlobeDisplay.RefreshViewers();
}
}



//Form2 is the parentForm

public partial class Form2 : Form
{
//MainForm mainform;

Form4 mrm;
private IGlobeControl m_globeControl;

public Form2()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
this.IsMdiContainer = true;

mrm = new Form4();

mrm.MdiParent = this;

mrm.Show();

}
}