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From an MDI application - Call MDI Child form method from the Parent form?

Hello,

"jaime_olivares" helped me on this question to call an MDI Parent Form method from a child form:
https://www.experts-exchange.com/questions/22983140/From-an-MDI-application-call-MDI-Parent-method-from-MDI-Child-And-Visa-Versa.html

Now I need to call a Child Forms method from its Parent. Anyone?

Here is my solution from "jaime_olivares" in the other question:
((MainForm2 )this.MDIParent).AddCamerastoButton();

NOTES:
- ChildMDItestForm = my Child form
- MainForm2 = my Parent Form
- AddCamerastoButton() method is on my MainForm2 = MDI Parent method

Jaime Olivares

in a mdi application you can have many child forms, not just one, so, how do you know which to call?

VirtueTech

ASKER

I tried this but I get an error:
((ChildMDItestForm)this.MdiChildren).upgradeLayoutbyXML(1);

ERROR:
Cannot convert type 'System.Windows.Forms.Form[]' to 'SW24RC_DevEx.ChildMDItestForm'

VirtueTech

ASKER

Similar to your comment jaime...the error states that I need to know which child form, thus the array.

I'm using the MDI Manager from DevExpress, and where I need to call the Child form method is always on the selected/active child form.

Jaime Olivares

MdiChildren is a collection. You have to pick one.

VirtueTech

ASKER

how?

ASKER CERTIFIED SOLUTION

Jaime Olivares

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VirtueTech

ASKER

Thank you Jaime! You're full of information and have been extremely helpful!