| Add | 
 Add an element to this element's contentContainer
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| Children | 
 Returns the elements from its contentContainer
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| Clear | 
 Remove all child elements from this element's contentContainer
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| ElementAt | 
 Retrieves the child element at position
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| Equals | 
 Compares instances of the Hierarchy struct for equality.
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| IndexOf | 
 Retrieves the index of the specified VisualElement in the Hierarchy.
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| Insert | 
 Insert an element into this element's contentContainer
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| Remove | 
 Removes this child from the hierarchy
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| RemoveAt | 
 Remove the child element located at this position from this element's contentContainer
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| Sort | 
 Reorders child elements from this VisualElement contentContainer.
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