The button appearance will be resetted with the mouseup event. I think 
you should be able to solve the issue using the "disappear" or 
"afterDisappear" event instead of directly handling this in the function.

Cheers,

Sebastian


Simon Bull schrieb:
> Hi All,
> 
> I'm using Qx 0.6.2-pre (r4314).
> 
> I am trying to dispose() of "closed" qx.ui.window.Window instances so 
> that I can minimise the browser's memory usage.
> 
> I invoke dispose() at the end of qx.ui.window.Window._onclosebuttonclick().
> 
> With this change, clicking the close button hide()s the window as usual, 
> but does not seem to be cleanly disposed (no memory appears to be 
> freed). The following message appear on the logging console:
> 
> qx.ui.form.Button[227]
> 007063: Could not dispatch event of type "mouseup": TypeError - 
> 'this._states' is null or not an object (#-2146823281)
> qx.theme.appearance.DefaultAppearanceTheme[7]
> 007063: Couldn't apply state appearance: TypeError - 'abandoned' is null 
> or not an object (#-2146823281)
> 007063: Couldn't apply state appearance: TypeError - 'pressed' is null 
> or not an object (#-2146823281)
> 007063: Couldn't apply state appearance: TypeError - 'maximized' is null 
> or not an object (#-2146823281)
> 007063: Couldn't apply state appearance: TypeError - 'active' is null or 
> not an object (#-2146823281)
> 
> 
> Does anyone know why these errors occur?  Is there a clean way to 
> dispose of qx.ui.window.Window instances?
> 
> Thanks,
> 
> Simon
> 
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