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Use two forms having MDI container active

I have a main form with a MDI container active as well as a childform with a MDI container active. I want child form with mdi container act as parent to another form while main form is a mdi parent to child form with mdi container. How can I achieve this. I tried with below code for both the case but it showed error stating " A form cannot be Mdi parent as well as Mdi Child"
enter code here myform.MdiParent = this;
myform.Show();

You cannot - the message is quite clear about that. It's simply a limitation of the system. MDI is very old, and hasn't been updated in quite a long time.
If you need some alternatives, you could look at making windows not top-level, for example. The windows behave a bit differently (both from MDI and normal windows), but depending on your actual needs, they might be sufficient (or even better than MDI in the first place).

MS UI Automation WinForms: Can't find grid field chooser window on UIA automation tree

We have an Infragistics UltraGrid control, and you can show a field chooser window for that grid.
However, the field chooser doesn't show up on the UIA automation tree. If I try searching for it programmatically then UIA doesn't find it, same if I try to manually look for it using UIA Verify.
But if I use UIA Verify hover/focus mode to find the field chooser, then it shows it, and also shows it under the same form as the grid control.
How do I find the control using code? Why doesn't it show up on the automation tree?

This appears to be a bug in the .NET framework related to forms created from MDI child forms. As a workaround, I've been able to use the AutomationElement.FromPoint() function.
Microsoft forum link
Quoting from Guy Barker (Microsoft):
"I can reproduce the issue you’re seeing. I set the main to be a mdi container, and created a child form, whose MdiParent is the main form. I then added the original owned form as owned by the mdi child form. When I did this, I could get the details of the owned form in Inspect, but the form didn’t appear in the UIA tree view.
Interestingly, when I view the ancestors of the owned form, it lists the mdi child form as the parent as expected. But for some reason, the mdi child form doesn’t consider the owned form to be one of its children.
I don’t have any suggestions as to how to workaround this at the moment, but I’ll post a comment here if I do find something."

It's Infragistic. Some components like ultratree, ultragrid, etc are not located in correct order on object tree.
Possible solutions:
Try to find your control from the root of the application window.
Simulate mouse and keyboard actions.
Get control as AutomationElement.FocusedElement and then go through elements parents

Bring to Front MDI Child in C#

I am new in using C# and its IDE, Visual Studio. I am now creating an internal frame embedded in a winform. I used MDI Child, setting my winform as MDI parent. The problem is that, whenever I run my MDI child inside the MDI client together with other components (panel, buttons, field, etc.), my MDI child appears behind those other components. Is there any way to bring my MDI child in front of all those components? If there is, please also help me how to set the MDI child location as it appears inside my winform. Your help will be very much appreciated. :)

Customize MDI in c#

In my project i have to run multi-interfaces at a time. I used isMdicontainer property. But problem is whole area is converted to MDI. Can i set boundaries for it,like in Photoshop(below menu-bar there is toolbar,below toolbar Mdi is appearing).
And I like the tab structure in Photoshop used to switch images. How can i introduce that into my project for switching between forms. I am using VS 2010, Doing project in C#(Win forms), net framework 3.5
Thanks in advance.

You can use container controls like Panels and Dock them to the side — this will reduce the area of the MDI child area.
As far as tabs are concerned, that's a different beast than the MDI model. You can try Multi Document Interface (MDI) tab page browsing with C#

You can do a lot of things,
The following tasks are illustrated Here:
Creating the main menu for your form. The actual name of the menu
will vary.
Adding the ToolStripPanel control to the Toolbox.
Creating a child form.
Arranging ToolStripPanel controls by z-order.

The following steps should give you a start.
Add a MenuBar a ToolStrip and a TabControl to your main form.
Set their Dock property to DockStyle.Top.
Resize the TabControl so that the tabpages are hidden.
When you open a new MDI form add a tab and select it.

Menu shortcuts and MDI in Windows forms

After I modified my application to the MDI application (main form became an MDI container), all of the shortcuts, which were specified int the main menu of the original form, are no longer works. What can I do in order to "turn them on" again?

The only thing that comes to mind is that you need to set the mdiparent property of any child form before you show it. You could have missed this when you switched the main form over.