Open new "child form" inside "parrent from" from already open child form.

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C#

Hi, I have three forms

MainForm
LoginForm
ControlPanelForm

Na Main form is MDI container, on load I start Login form inside MDI, after user enter information and press button I need to open Control Panel form but inside MDI container.

This is what I try:

ControlPanelForm OpenNew = new ControlPanelForm();
//OpenNew.MdiParent = this;
OpenNew.MdiParent = MainForm.MainForm;
OpenNew.Show();

I dont know how to reference to mainForm