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https://chanakyajayabalan.wordpress.com/2010/10/22/cant-move-focus-to-the-control-because-it-is-invisible-not-enabled-or-of-a-type-that-does-not-accept-the-focus-sharepoint-custom-edit-form/
Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus + Sharepoint Custom Edit Form