如果附加此 UIDocument 組件的 GameObject 有父物件，而且該父物件也附加了 UIDocument 組件，系統會自動將此值設定為父物件的 UIDocument 組件。
如果 UIDocument 有父物件，您無法將它直接新增到面板中。Unity 會將它新增到父物件的根部視覺元素中。
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