ILayoutElement.flexibleWidth

Description

The extra relative width this layout element should be allocated if there is additional available space.

#pragma strict
// Required when using UI elements.
public var MyContentPanel;
//Sets the flexible height on on all children in the content panel.
public function Start() {
	//Assign all the children of the content panel to an array.
	var myLayoutElements = MyContentPanel.GetComponentsInChildren.<LayoutElement>();
	//For each child in the array change its LayoutElement's flexible width to 200.
	for (var element in myLayoutElements) {
		element.flexibleWidth = 200f;
	}
}

using UnityEngine;
using System.Collections;
using UnityEngine.UI; // Required when using UI elements.

public class ExampleClass : MonoBehaviour
{
	public Transform MyContentPanel;

	//Sets the flexible height on on all children in the content panel.
	public void Start()
	{
		//Assign all the children of the content panel to an array.
		LayoutElement[] myLayoutElements = MyContentPanel.GetComponentsInChildren<LayoutElement> ();

		//For each child in the array change its LayoutElement's flexible width to 200.
		foreach(LayoutElement element in myLayoutElements)
		{
			element.flexibleWidth = 200f;
		}
	}
}

Setting preferredWidth to -1 removed the preferredWidth.