If you have a collapsed component with height = 0 and want to expand this component and you don't know what will be the new height value. The only info you have is that you want to expand it. How will you set the new height value ?!!
var dumyNumber:Number; // just NaN mycomponent.height = dumyNumber; That is all :). But if you tried the following it will not work:
mycomponent.height = NaN;
// won't work only assigned to a variable is valid
You can also set
mycomponent.percentHeight = 100. But what if you want to make a resize transition? In this case you must set
heightTo value to NaN
My case was as the following:
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