Tracy / Michael, The parent/child relationship (post application root) in MXML is constrained to DisplayObjectContainer and DisplayObject relationships... this rule does not apply to components within an item renderer.
http://www.adobe.us/livedocs/flex/2/langref/mxml/component.html So... The question really is what is the inheritance of the DetailPopUp? Does it trace back to UIComponent? If not... Then that is what is preventing him from using the component in both contexts. The simple solution would be to extend UIComponent, mark includeInLayout as false, and make sure his scripts are all playing nice. Rick Winscot On 12/12/08 2:18 PM, "Tracy Spratt" <[email protected]> wrote: > > > > It IS, or at least was, the case that non-visual components must be at the > root mxml scope. I will try to find it documented. > > If the component is non-visual, then it does not matter, functionally > speaking, where in the DOM it goes. > > Tracy > > > > From: [email protected] [mailto:[email protected]] On Behalf > Of Rick Winscot > Sent: Friday, December 12, 2008 1:25 PM > To: [email protected] > Subject: Re: [flexcoders] Restrictions on non-visual component placement > > > It¹s difficult to determine what your problem is without knowing a little more > about what your DetailPopUp does/is. If you post some code it would be far > easier to determine why one context works and another doesn¹t. Generally... I > wouldn¹t recommend mingling non-visual and visual components in mxml. > > Your error basically says that your non-visual component doesn¹t have an > appropriate interface for the context you are placing it in. e.g. It should be > a IUIComponent. > > http://livedocs.adobe.com/flex/201/langref/mx/core/IUIComponent.html > > Rick Winscot > > > On 12/12/08 12:49 PM, "Michael Prescott" <[email protected]> wrote: >> >> >> >> >> Short version: >> >> I have a non-visual component that I'm trying to declare in a repeater, but >> it seems that MXML doesn't allow this. Is this true? How do you get around >> this, create a visual component to wrap the non-visual component? >> >> Long version: >> >> I have an ActionScript non-visual component whose declaration looks like >> this: >> >> public class DetailPopup extends EventDispatcher implements IMXMLObject >> >> I've used this successfully inside an inline, MXML item renderer, like this: >> >> <mx:DataGridColumn> >> <mx:itemRenderer> >> <mx:Component> >> <mx:VBox> >> >> <!-- a bunch of other stuff, and then my: --> >> >> <my:DetailPopUp/> >> >> <mx:VBox> >> </mx:Component> >> </mx:itemRenderer> >> </mx:DataGridColumn> >> >> >> Now that I'm switching from a DataGrid to a Grid, the code ought to look like >> this: >> >> <mx:GridItem> >> <mx:VBox> >> >> <!-- a bunch of other stuff, and then my: --> >> >> (X) <my:DetailPopUp/> >> >> <mx:VBox> >> </mx:GridItem> >> >> ..except that I'm getting an error, "Component declarations are not allowed >> here. (Note: visual children must implement IUIComponent.)" >> >> After trying out a bunch of scenarios, it looks like non-visual components >> can only be declared in the outermost scope of a component or application. >> Is this true? This is rather awkward, as I need a DetailPopUp for each >> griditem. >> >> Any tips would be very helpful! >> >> Michael >> >> > >
