I think i found that the bindings are not reevaluated if they are overwritten.

So for now i have to create some pseudo ContextProperties at the start of my application:

Qt Code: 
  1. context->setContextProperty("someObjectInstance", NULL);
  2. context->setContextProperty("otherProperty", NULL);
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and later if a Object gets instantiated, i just overwrite these:

Qt Code: 
  1. context->setContextProperty("someObjectInstance", someObjectInstance);
  2. context->setContextProperty("otherProperty", otherQObject);
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It works...but its ugly...

Is it even ok to overwrite a ContextProperty?