Hi everyone, I'm facing an unexpected behaviour of a TabNavigator that I think (watching the Flex framework sources) can be applied to the ViewStack too. Don't know if it's a bug, but any help is appreciated. I have a TabNavigator containing a few children. Every children has a DataGrid whose columns dataField, headerText, width and itemEditor are determined depending on the result of a server call. So I created the DataGrids without specifying the columns and tried to set this property using ActionScript, at runtime. I've set creationPolicy="all" so I can set all the columns with one call. Everything goes fine for the first tab (the visible one), but the others show columns with wrong widths: all the column but the last have a very small width, while the last one is very large. Looking at the DataGrid code and using some trace statements I think I discovered what's happening: the hidden tabs (whose children instances are correctly "alive") have 0 width and 0 height. The updateDisplayList method of DataGrid instances finds that the DataGridColumns have an owner, but this owner is too little to fit the columns... so they are resized. When a tab becomes visible (though it doesn't dispatch the visible event!) the grid is resized and the last column becomes very large. The same happens if I create an empty TabNavigator and add the children at runtime with the addChild method. So: is it right that the freshly created children of a TabNavigator have 0 width and 0 height? Shouldn't they have the same width and height of the visible tab even if hidden? A possible workaround could be trying to listen for changes of the TabNavigator selectedIndex proeprty, but I have many forms with this kind of layout so I'd prefer to manage this strange behaviour working on the children. I created a DataGrid subclass who tries to set the columns at the right time, but the tab switching doesn't cause a event fire in the children (I expected a visible event, for instance)... so I can't find that "right time". What do you think?
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