WPF UserControl Memory leak

Question

Hi

I have a UserControl in an application where I am constantly swapping the Content property with other UIElements.

However I noticed in Task Manage after a while the memory goes up after a number of swaps...

Using AntProfiler I noticed for some reason there ToolBarAutomationPeer that the UserControl references....

To fix this Memory leak I made my own usercontrol with the following code

public class MyUserControl : UserControl
{
    protected override System.Windows.Automation.Peers.AutomationPeer OnCreateAutomationPeer()
    {

        return null;        
    }

}

This seems to remove any AutomationPeers that THe usercontrol may reference that may keep the Content that I am swapping in memory...

But I am still interested to know how did a ToolBarAutomationPeer get into my UserControl and what are the ramifications of me returning null in the OnCreateAutomationPeer method?

I am not well versed with Automation callses and not sure when they would be useful

Thanks