Ans:
width:
Number that specifies the width of the component, in pixels, in the parent's coordinates. The default value is 0, but this property contains the actual component width after Flex completes sizing the components in your application.
explicitWidth:
This value is used by the container in calculating the size and position of the component. It is not used by the component itself in determining its default size. Thus this property may not have any effect if parented by Container, or containers that don't factor in this property. Because the value is in component coordinates, the true explicitWidth with respect to its parent is affected by the scaleX property. This property can be used as the source for data binding.
measuredMinWidth:
The default minimum width of the component, in pixels. This value is set by the measure() method.
measuredWidth:
The default width of the component, in pixels. This value is set by the measure() method.
percentWidth:
Number that specifies the width of a component as a percentage of its parent's size. Allowed values are 0-100. The default value is NaN. Setting the width or explicitWidth properties resets this property to NaN.
This property returns a numeric value only if the property was previously set; it does not reflect the exact size of the component in percent. This property is always set to NaN for the UITextField control. This property can be used as the source for data binding.