ManagedForm.FormOwner

Read and write.Type: TableBox; TextBox; Form; FormField; ManagedForm; FormTable.
Contains a managed form or control that is the owner of the given form. Using this property establishes a link between the form and its owner. For example, an element form of a subordinate catalog could have as its owner an element form of the owner catalog from where it was opened. When a table box is opened in the current row, the table box is set as an owner of the current row.
Thin client, web-client, thick client, Mobile application (client).If the form has an owner, then the CloseOnOwnerClose property specifies if it is required to close the form when the owner form is closed.

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