Programmaticaly create and style panelbar

I have a panelbar on a usercontrol. This panelbar was added with the VS Designer and thus looks great. Runtime this panelbar is filled with nodes. The top level nodes look good, because they are nodes in the panelbar that was created with the designer.
Now when I add nested panelbars runtime, they look horrible. What I do is, I enable the "EnableHostControlMode" for the top node and create a new panelbar from scratch which I add to the ContentPanel.Controls.

My question: How do I get the nested panelbars to look the same as their parents, programmaticaly?

Here's a piece of the code:
else if (mftn.Nodes.Count > 0)
{
    rpgeToAdd.EnableHostControlMode = true;
    rpgeToAdd.ContentPanel.Dock = DockStyle.Fill;
    rpgeToAdd.ContentPanel.BackColor = System.Drawing.Color.Transparent;

    Point location = new Point(0, 0);
    for (int i = 0; i < mftn.Nodes.Count; i++)
    {
        RadPanelBar newNode = BuildPanelbarElementNode(mftn.Nodes[i]);
        newNode.Size = new Size(100, 100);
        newNode.Location = location;
        locaction.Y += 100;
        rpgeToAdd.ContentPanel.Controls.Add(newNode);
     }
}

But, at runtime it is impossible for me to specify the size, since the control is built up like an explorer tree, recursively etc. Is there any way to set the panelbar size to the available space? Because now I get several scrollbars if there are multiple levels of nested panelbars.

Any ideas are greatly appreciated :)