Sencha Architect Design View goes blind when...

I added a Ext.tab.Panel to a root of 'Views' in (Project Inspector) to do some design over it, but when I change the property header to true (default appear to be false in the Config property area), when I change the value... the Design View just disappear and no matter that I select another view object, it can't show any of them.

To pass over this problem I have to close Sencha Architect and then start it once again.

Quote:

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P.D.
Sorry if someone else have been reported this... and probably you consider this as repetitive, I'm new here so Im learning how to search here.

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I can confirm that Ext 4.1.x has a header configuration in the docs and when setting it to true is throwing an error.
http://docs.sencha.com/ext-js/4-1/#!...nel-cfg-header

Ext 4.0.x does not expose a header configuration.
http://docs.sencha.com/ext-js/4-0/#!/api/Ext.tab.Panel

We'll investigate it. THanks for the report.